Reviewed by Wichuda Atthamethakon, LL.M., Thai Bar Licence 3149/2556, for ThaiLawOnline, a Thai law firm acting for foreigners since 2006.
Update log
- 2 November 2026: Added the statute box with Thai, English and French text and checked the page against the official text
Last reviewed: 22 September 2026. Every statutory statement on this page was read in Thai against the consolidated text of the Nationality Act B.E. 2508 as amended to the Nationality Act (No. 5) B.E. 2555, from the central legal register (law.go.th): sections 5, 7, 9, 10, 11, 12, 13, 14, 19, 22, 23 and 24, and the fee schedule annexed to the Act. Section 11(4), the exemption for the husband of a Thai national, was also read in the amending Act that added it, the Nationality Act (No. 4) B.E. 2551. The income figure, the interview, the anthems and the processing time are administrative practice, not provisions of the Act, and are marked as such below. On 27 September 2026 sections 67 and 68 of the Civil and Commercial Code Amendment Act (No. 24) B.E. 2567 were read in Thai for the same-sex spouse paragraph, and the Department of Provincial Administration’s draft amendment was checked against the consultation record on the central legal register.
Most foreigners who end up applying for Thai citizenship did not plan to. They came for a job, a marriage or a few years, and a decade later Thailand is home while the law still treats them as visitors. That means an extension every year, TM30 and 90-day reports, a work permit tied to one employer, a re-entry permit for every trip, no land in your own name and, in the sectors the Foreign Business Act restricts, no majority stake in your own company.
A Thai national carries none of that. A naturalised Thai is Thai under the Land Code and the Foreign Business Act, though not for every purpose: section 95 of the Constitution requires five years as a Thai before voting, section 97 limits candidacy for the House of Representatives to Thais by birth, and section 19 of the Nationality Act allows revocation. This guide explains who can become Thai, what the Nationality Act actually requires, where the authorities add requirements of their own, and how an application moves from filing to the Royal Gazette.
Table of Contents
The four ways to become Thai
- By birth (section 7). A person born of a Thai father or a Thai mother is Thai from birth, whether born in Thailand or abroad. The child of a Thai parent needs no application for nationality.
- A foreign wife of a Thai national (section 9). An alien woman married to a Thai may apply for Thai nationality directly. This is not naturalisation, and the section 10 conditions do not apply to it. The grant is in the discretion of the Minister.
- Naturalisation (sections 10 to 12). The route for everyone else, including the foreign husband of a Thai national.
- Recovery (sections 23 and 24). For a person who was Thai and lost that nationality, for example a Thai who renounced it on marrying a foreigner and whose marriage has since ended.
The law behind this page
English
Section 10 Nationality Act B.E. 2508
Full text
An alien who has all of the following qualifications may apply for naturalisation as a Thai: (1) having reached majority under Thai law and the law of the person's nationality; (2) being of good conduct; (3) having a regular occupation; (4) having been domiciled in the Kingdom of Thailand continuously up to the date of filing the naturalisation application for not less than 5 years; (5) having knowledge of the Thai language as prescribed by ministerial regulation.
ThaiLawOnline translation
Section 11 Nationality Act B.E. 2508
Full text
The provisions of section 10 (4) and (5) do not apply if the applicant for naturalisation as a Thai: (1) has rendered special meritorious service to Thailand, or has done work beneficial to the government service, which the Minister considers appropriate; (2) is a child, wife or husband of a person who has been naturalised as a Thai or has recovered Thai nationality; (3) previously had Thai nationality; (4) is the husband of a person of Thai nationality.
ThaiLawOnline translation
Section 9 Nationality Act B.E. 2508
Full text
An alien woman who has married a person of Thai nationality and who wishes to acquire Thai nationality shall file an application with the competent official in the form and by the procedure prescribed by ministerial regulation. The grant or refusal of Thai nationality is at the discretion of the Minister.
ThaiLawOnline translation
Section 12 Nationality Act B.E. 2508
Full text
A person who wishes to apply for naturalisation as a Thai shall file an application with the competent official in the form and by the procedure prescribed by ministerial regulation. If the person wishing to apply for naturalisation under paragraph 1 has a child who has not reached majority under Thai law and who is domiciled in Thailand, that person may apply for naturalisation for the child at the same time as for himself or herself, and the child is exempted from the qualifications in section 10 (1), (3), (4) and (5). The grant or refusal of naturalisation is at the discretion of the Minister. When the Minister considers it appropriate to grant it, the matter shall be submitted to the King for royal permission. Once royal permission has been given, the applicant shall take an oath to be loyal and honest to Thailand. Once the notification under section 5 has been made, the competent official shall issue a certificate of naturalisation to that person as evidence.
ThaiLawOnline translation
Section 7 Nationality Act B.E. 2508
Full text
The following persons acquire Thai nationality by birth: (1) a person born of a father or mother of Thai nationality, whether born inside or outside the Kingdom of Thailand; (2) a person born in the Kingdom of Thailand, except a person under section 7 bis paragraph 1. The word “father” in (1) includes a person proved to be the father of the person born, by the method prescribed by ministerial regulation, even if that person did not register a marriage with the mother of the person born and did not register recognition of the person born as a child.
ThaiLawOnline translation
Section 5 Nationality Act B.E. 2508
Full text
Acquisition of Thai nationality under section 9, section 12 or section 12/1, loss of Thai nationality under Chapter 2, or recovery of Thai nationality under Chapter 3 takes effect only upon publication in the Government Gazette, and takes effect personally only.
ThaiLawOnline translation
Section 19 Nationality Act B.E. 2508
Full text
The Minister has the power to revoke the Thai nationality of a person who acquired Thai nationality by naturalisation where it appears that: (1) the naturalisation was obtained by concealing facts or making false statements on material matters; (2) there is evidence showing that the naturalised person still uses his or her former nationality; (3) the person has done any act affecting the security of, or contrary to the interests of, the State, or insulting the nation; (4) the person has done any act contrary to public order or good morals; (5) the person has gone to live abroad without a domicile in Thailand for more than 5 years; (6) the person still has the nationality of a country at war with Thailand. Revocation of Thai nationality under this section may extend to a child of the person whose Thai nationality is revoked, if that child has not reached majority and acquired Thai nationality under section 12 paragraph 2. When the Minister has ordered revocation of Thai nationality, the matter shall be reported to the King for his information.
ThaiLawOnline translation
Section 22 Nationality Act B.E. 2508
Full text
A person of Thai nationality who has been naturalised as an alien, or who renounces Thai nationality, or whose Thai nationality is revoked, loses Thai nationality.
ThaiLawOnline translation
ไทย
มาตรา 10 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
คนต่างด้าวซึ่งมีคุณสมบัติครบถ้วนดังต่อไปนี้ อาจขอแปลงสัญชาติเป็นไทยได้ (๑) บรรลุนิติภาวะแล้วตามกฎหมายไทยและกฎหมายที่บุคคลนั้นมีสัญชาติ (๒) มีความประพฤติดี (๓) มีอาชีพเป็นหลักฐาน (๔) มีภูมิลำเนาในราชอาณาจักรไทยต่อเนื่องมาจนถึงวันที่ยื่นคำขอแปลงสัญชาติเป็นไทยเป็นเวลาไม่น้อยกว่าห้าปี (๕) มีความรู้ภาษาไทยตามที่กำหนดในกฎกระทรวง
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 11 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
บทบัญญัติในมาตรา ๑๐ (๔) และ (๕) มิให้นำมาใช้บังคับ ถ้าผู้ขอแปลงสัญชาติเป็นไทย (๑) ได้กระทำความดีความชอบเป็นพิเศษต่อประเทศไทย หรือได้ทำคุณประโยชน์ให้แก่ทางราชการซึ่งรัฐมนตรีเห็นสมควร (๒) เป็นบุตร ภริยา หรือสามีของผู้ซึ่งได้แปลงสัญชาติเป็นไทย หรือของผู้ได้กลับคืนสัญชาติไทย (๓) เป็นผู้ได้เคยมีสัญชาติไทยมาก่อน (๔) เป็นสามีของผู้มีสัญชาติไทย
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 9 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
หญิงซึ่งเป็นคนต่างด้าวและได้สมรสกับผู้มีสัญชาติไทย ถ้าประสงค์จะได้สัญชาติไทย ให้ยื่นคำขอต่อพนักงานเจ้าหน้าที่ตามแบบและวิธีการที่กำหนดในกฎกระทรวง การอนุญาตหรือไม่อนุญาตให้ได้สัญชาติไทยให้อยู่ในดุลพินิจของรัฐมนตรี
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 12 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
ผู้ใดประสงค์จะขอแปลงสัญชาติเป็นไทย ให้ยื่นคำขอต่อพนักงานเจ้าหน้าที่ตามแบบและวิธีการที่กำหนดในกฎกระทรวง ถ้าผู้ประสงค์จะขอแปลงสัญชาติเป็นไทยตามวรรคหนึ่งมีบุตรซึ่งยังไม่บรรลุนิติภาวะตามกฎหมายไทย และบุตรนั้นมีภูมิลำเนาอยู่ในประเทศไทย อาจขอแปลงสัญชาติเป็นไทยให้แก่บุตรพร้อมกับตนได้ โดยบุตรนั้นได้รับการยกเว้นไม่ต้องมีคุณสมบัติตามมาตรา ๑๐ (๑) (๓) (๔) และ (๕) การอนุญาตหรือไม่อนุญาตให้แปลงสัญชาติเป็นไทย ให้อยู่ในดุลพินิจของรัฐมนตรี เมื่อรัฐมนตรีเห็นสมควรอนุญาตให้นำความกราบบังคมทูลขอพระราชทานพระบรมราชานุญาต เมื่อได้รับพระราชทานพระบรมราชานุญาตแล้ว ให้ผู้ขอแปลงสัญชาติเป็นไทยปฏิญาณตนว่า จะมีความซื่อสัตย์สุจริตต่อประเทศไทย เมื่อมีประกาศตามมาตรา ๕ แล้ว ให้พนักงานเจ้าหน้าที่ออกหนังสือสำคัญการแปลงสัญชาติเป็นไทยให้ไว้แก่ผู้นั้นเป็นหลักฐาน
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 7 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
บุคคลดังต่อไปนี้ย่อมได้สัญชาติไทยโดยการเกิด (๑) ผู้เกิดโดยบิดาหรือมารดาเป็นผู้มีสัญชาติไทย ไม่ว่าจะเกิดในหรือนอกราชอาณาจักรไทย (๒) ผู้เกิดในราชอาณาจักรไทย ยกเว้นบุคคลตามมาตรา ๗ ทวิ วรรคหนึ่ง คำว่าบิดาตาม (๑) ให้หมายความรวมถึงผู้ซึ่งได้รับการพิสูจน์ว่าเป็นบิดาของผู้เกิดตามวิธีการที่กำหนดในกฎกระทรวง แม้ผู้นั้นจะมิได้จดทะเบียนสมรสกับมารดาของผู้เกิด และมิได้จดทะเบียนรับรองผู้เกิดเป็นบุตรก็ตาม
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 5 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
การได้สัญชาติไทยตามมาตรา ๙ มาตรา ๑๒ หรือมาตรา ๑๒/๑ การเสียสัญชาติไทยตามหมวด ๒ หรือการกลับคืนสัญชาติไทยตามหมวด ๓ ให้มีผลต่อเมื่อได้ประกาศในราชกิจจานุเบกษา และให้มีผลเฉพาะตัว
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 19 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
รัฐมนตรีมีอำนาจถอนสัญชาติไทยแก่ผู้ซึ่งได้สัญชาติไทยโดยการแปลงสัญชาติ เมื่อปรากฏว่า (๑) การแปลงสัญชาตินั้นได้เป็นไปโดยปกปิดข้อเท็จจริงหรือแสดงข้อความเท็จอันเป็นสาระสำคัญ (๒) มีหลักฐานแสดงว่าผู้แปลงสัญชาตินั้นยังใช้สัญชาติเดิม (๓) กระทำการใด ๆ อันเป็นการกระทบกระเทือนต่อความมั่นคงหรือขัดต่อประโยชน์ของรัฐ หรือเป็นการเหยียดหยามประเทศชาติ (๔) กระทำการใด ๆ อันเป็นการขัดต่อความสงบเรียบร้อยหรือศีลธรรมอันดีของประชาชน (๕) ไปอยู่ในต่างประเทศโดยไม่มีภูมิลำเนาในประเทศไทยเป็นเวลาเกินห้าปี (๖) ยังคงมีสัญชาติของประเทศที่ทำสงครามกับประเทศไทย การถอนสัญชาติไทยตามมาตรานี้ จะขยายไปถึงบุตรของผู้ถูกถอนสัญชาติไทยในเมื่อบุตรนั้นยังไม่บรรลุนิติภาวะและได้สัญชาติไทยตามมาตรา ๑๒ วรรคสองด้วยก็ได้ และเมื่อรัฐมนตรีสั่งถอนสัญชาติไทยแล้วให้นำความกราบบังคมทูลเพื่อทรงทราบ
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
มาตรา 22 พระราชบัญญัติสัญชาติ พ.ศ. 2508
ข้อความเต็ม
ผู้ซึ่งมีสัญชาติไทยและได้แปลงสัญชาติเป็นคนต่างด้าว หรือสละสัญชาติไทย หรือถูกถอนสัญชาติไทย ย่อมเสียสัญชาติไทย
ตรงตามข้อความในราชกิจจานุเบกษา / สำนักงานคณะกรรมการกฤษฎีกา (Verbatim from the Royal Gazette / Office of the Council of State)
Français
Article 10 Nationality Act B.E. 2508
L'étranger peut demander la naturalisation s'il réunit: majorité selon le droit thaï et sa loi nationale, bonne conduite, profession stable, domicile continu en Thaïlande d'au moins 5 ans jusqu'à la demande, et connaissance du thaï fixée par règlement ministériel.
résumé non officiel
Article 11 Nationality Act B.E. 2508
L'article 10 (4) et (5) ne s'applique pas au demandeur ayant rendu des services spéciaux à la Thaïlande ou à l'administration jugés suffisants par le Ministre, à l'enfant ou au conjoint d'un naturalisé ou réintégré, à l'ancien Thaï, ou à l'époux d'une personne de nationalité thaïe.
résumé non officiel
Article 9 Nationality Act B.E. 2508
L'étrangère mariée à une personne de nationalité thaïe qui souhaite l'acquérir dépose une demande auprès de l'agent compétent selon le règlement ministériel; le Ministre l'accorde ou la refuse discrétionnairement.
résumé non officiel
Article 12 Nationality Act B.E. 2508
La demande est déposée auprès de l'agent compétent; l'enfant mineur du demandeur, domicilié en Thaïlande, peut être inclus, dispensé de l'article 10 (1), (3), (4) et (5). Le Ministre décide discrétionnairement, sous permission royale; suivent le serment de loyauté et, après publication selon l'article 5, le certificat.
résumé non officiel
Article 7 Nationality Act B.E. 2508
Est thaï de naissance l'enfant d'un père ou d'une mère thaïs, né en Thaïlande ou ailleurs, ou la personne née en Thaïlande, sauf cas de l'article 7 bis alinéa 1. Le père comprend celui dont la paternité est prouvée selon règlement ministériel, même sans mariage enregistré ni reconnaissance.
résumé non officiel
Article 5 Nationality Act B.E. 2508
L'acquisition de la nationalité thaïe selon les articles 9, 12 ou 12/1, sa perte (chapitre 2) ou sa réintégration (chapitre 3) ne produisent effet qu'après publication au Journal officiel, et à titre strictement personnel.
résumé non officiel
Article 19 Nationality Act B.E. 2508
Le Ministre peut retirer la nationalité au naturalisé pour fraude, usage de la nationalité d'origine, atteinte à l'État ou à la nation, à l'ordre public ou aux bonnes mœurs, plus de 5 ans à l'étranger sans domicile thaïlandais, ou nationalité d'un pays en guerre; retrait extensible à l'enfant mineur naturalisé.
résumé non officiel
Article 22 Nationality Act B.E. 2508
Perd la nationalité thaïe la personne qui se fait naturaliser étrangère, y renonce ou se la voit retirer.
résumé non officiel
Sources
- Nationality Act B.E. 2508, retrieved 2 November 2026
What naturalisation requires under section 10
Section 10 sets five conditions. The applicant must:
- be of full age under Thai law and under the law of their own nationality;
- be of good behaviour;
- have an established occupation;
- have had a domicile in Thailand continuously for at least five years up to the date of the application; and
- have knowledge of the Thai language as prescribed by ministerial regulation.
The Act sets no income figure and does not mention permanent residence. In practice the five years of domicile are counted from a grant of permanent residence, so an applicant who is not exempt usually spends three years on extensions of stay, obtains a residence permit, lives in Thailand as a resident for five years and only then files for citizenship.
Who is excused the five years and the language requirement
Section 11 disapplies conditions (4), the five years of domicile, and (5), the Thai language, for four groups of applicants:
- a person who has done something of special merit for Thailand or rendered a service to the government that the Minister considers appropriate;
- the child, wife or husband of a person who has been naturalised Thai or has recovered Thai nationality;
- a person who formerly held Thai nationality; and
- the husband of a Thai national, a limb added by section 9 of the Nationality Act (No. 4) B.E. 2551.
The exemption covers only those two conditions. A husband of a Thai must still be of age, of good behaviour and in an established occupation, and the authorities still assess him on the criteria described below.
Married to a Thai: husbands and wives take different routes
The Act treats the two spouses differently, and the difference decides which application you file.
- A foreign husband naturalises under section 10. Section 11(4) removes the five years of domicile and the Thai language requirement, so he does not need permanent residence first.
- A foreign wife does not naturalise at all. She applies under section 9, in the form and by the procedure set by ministerial regulation, and the Minister decides in his discretion. Section 11(4) does not mention her, and no other limb of section 11 covers the wife of a Thai by birth.
For a same-sex spouse, section 11(4) is closed, and section 9 is open on its words only to a foreign woman. Section 11(4) is written for a husband. Section 9 is written for a foreign woman married to a person of Thai nationality and does not say that person must be a man, though no practice under it is published and the grant stays in the Minister’s discretion. The Marriage Equality Act (the Civil and Commercial Code Amendment Act (No. 24) B.E. 2567) did not rewrite them. Its section 67 reads a law’s references to a husband or a wife as including any registered spouse, but its second paragraph switches that off where a law gives a husband and a wife different rights, which is how sections 9 and 11(4) are built. A foreign man married to a Thai man therefore naturalises the ordinary way under section 10, without the section 11(4) waivers, or builds towards permanent residence first. Our guide to same-sex marriage in Thailand sets out which rights carried across and which did not.
A change has been proposed, and it is not law. Section 68 of the Marriage Equality Act told each government agency to review the laws in its charge that treat husbands and wives differently and to send any amending bill to the Cabinet. The Department of Provincial Administration, which administers the Nationality Act, held a public consultation from 22 May to 21 June 2026 on the principles of an amendment that would replace “woman”, “husband” and “wife” with gender-neutral words such as “spouse”. On 14 June 2026 the department said the proposal had not yet gone to the government or to Parliament. As at 27 September 2026 it has published no summary of the consultation’s results and we have found no bill. Until an amending Act appears in the Royal Gazette, sections 9 and 11(4) apply as written.
What the authorities look for beyond the Act
The Act gives the Minister discretion, and the Ministry of Interior and Special Branch apply their own criteria when they exercise it. These are administrative practice, not law, and they change more often than the Act does, so confirm the current figures before you file:
- Income. An applicant married to a Thai national and working in Thailand is expected to earn at least 40,000 baht a month, with tax returns to prove it. A higher figure applies to applicants who are not married to a Thai.
- Interview. The interview is conducted in Thai, and applicants are commonly asked to sing the National Anthem and the Royal Anthem.
- Documents. Expect to provide your passport and residence documents, work permit and tax records, marriage and birth certificates where relevant, a police clearance and photographs. Foreign documents usually need translation and legalisation.
How an application moves, and what it costs
In Bangkok, naturalisation applications are lodged with the Special Branch Bureau of the Royal Thai Police, at the National Police headquarters on Rama 1 Road. Section 12 then sets the sequence:
- the application is filed in the form and by the procedure set by ministerial regulation;
- the Minister decides whether to allow it, in his discretion;
- if he allows it, royal permission is sought;
- once royal permission is granted, the applicant takes an oath of loyalty to Thailand; and
- the naturalisation takes effect only when it is published in the Royal Gazette (section 5), after which the naturalisation certificate is issued.
An applicant with minor children domiciled in Thailand may apply for them at the same time. Section 12 excuses those children the conditions of age, occupation, domicile and language.
Fees. The schedule annexed to the Act sets ceilings, and section 6 lets the Minister charge any amount up to them: 10,000 baht for a naturalisation application, 5,000 baht for each minor child applying with a parent, 1,000 baht for the naturalisation certificate and 2,000 baht for an application to recover Thai nationality. The fee actually charged is set by ministerial regulation within those ceilings, so confirm it when you file.
Time. Nothing in the Act fixes a timetable. In practice the file takes several years from filing to the Gazette notice, and for an applicant who needs permanent residence first the whole path runs to a decade or more.
Keeping your current passport
The Nationality Act contains no general rule that a foreigner who naturalises as Thai must give up the nationality they already hold. Whether your other country allows you to keep its nationality is a question for the law of that country, and you should check it before you apply.
For people who are Thai already, section 22 lists the ways Thai nationality is lost: naturalising as an alien, renouncing it, or having it revoked. Acquiring another nationality by descent, marriage or registration is none of those. Section 14 is narrower than it is often described: it applies to a Thai born while a parent was an alien who also holds the nationality of that parent, and to a child who became Thai with a naturalised parent under section 12 paragraph 2 or under section 12/1(2) and (3), and requires anyone in that position who wishes to keep the other nationality to renounce Thai nationality within one year of turning twenty. Section 13 lets a Thai married to a foreigner, who may take the nationality of the spouse under the law of the spouse, renounce Thai nationality if they wish to, and section 23 lets them recover it once the marriage has ended.
Can naturalisation be taken away?
Yes, but only on the grounds in section 19, which applies only to people who became Thai by naturalisation: concealing a fact or making a false statement on a material point in the application; evidence that the person still uses their former nationality; acts affecting national security, contrary to the interests of the State or insulting to the nation; acts contrary to public order or good morals; living abroad without a domicile in Thailand for more than five years; and still holding the nationality of a country at war with Thailand.
Where to start
The first question is eligibility: which route your marriage, residence and income actually support, and whether any exemption in section 11 applies to you. If you need permanent residence first, our permanent residency guide sets out the annual quota and our fixed fee for the application. For a review of your own position, book an immigration consultation.
Frequently asked questions
How can a foreigner get Thai citizenship?
Most foreigners naturalise under sections 10 to 12 of the Nationality Act, usually after holding permanent residence for five years. A foreign wife of a Thai national applies under section 9 instead, and a child of a Thai father or mother is Thai from birth under section 7 and needs no application.
Can I get Thai citizenship by marrying a Thai?
Marriage does not confer Thai nationality by itself. A foreign wife applies under section 9, and the Minister decides in his discretion. A foreign husband naturalises under section 10, and section 11(4) excuses him the five years of domicile and the Thai language requirement, while the other conditions still apply.
Do I need permanent residence before I can apply?
The Act does not say so. Section 10(4) requires five years of continuous domicile in Thailand, and in practice those years are counted from a grant of permanent residence. Applicants covered by section 11, including the husband of a Thai national, are excused the five years.
Do I have to speak Thai?
Section 10(5) requires knowledge of Thai as prescribed by ministerial regulation, and section 11 excuses certain applicants, including the husband of a Thai national. In practice the interview is conducted in Thai whatever the route.
How long does it take to get Thai citizenship?
The Act sets no timetable. In practice an application takes several years from filing to publication in the Royal Gazette, and the whole path, including permanent residence where it is needed, usually runs to a decade or more.
How much does a Thai citizenship application cost?
The schedule to the Nationality Act caps the fees at 10,000 baht for a naturalisation application, 5,000 baht for each minor child applying with a parent and 1,000 baht for the naturalisation certificate. The amount charged is set by ministerial regulation within those caps.
Does Thailand allow dual citizenship?
The Nationality Act has no general rule that a foreigner who naturalises as Thai must give up their existing nationality. Whether your other country allows you to keep it is a question for the law of that country, and worth checking before you apply.
Can a same-sex spouse get Thai citizenship by marriage?
Not through section 11(4), which is written for a foreign husband, and section 67 paragraph 2 of the Marriage Equality Act keeps provisions that treat a husband and a wife differently as they were. Section 9 covers a foreign woman married to a person of Thai nationality and does not say that person must be a man, but the grant stays in the Minister’s discretion. A same-sex spouse can apply under section 10 without the section 11(4) waivers, or obtain permanent residence first. A draft amendment making the wording gender-neutral went to public consultation in May and June 2026, but it is not law.
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