Defamation Laws in Thailand: Criminal Charges for Social Media Posts and Comments

Last updated on April 12, 2026

Thailand is one of the few countries where defamation is still a criminal offence. Most Western countries treat defamation as a purely civil matter. Thailand is different. Thai law allows both prosecutors and private complainants to seek imprisonment for statements that harm another person’s reputation.

This guide covers the full legal framework for defamation in Thailand. It explains the criminal provisions under the Thai Criminal Code, the civil remedies under the Civil and Commercial Code, and the additional liability under the Computer Crime Act. It is written for expatriates, business owners, journalists, and content creators who need to understand their legal exposure.

For a detailed analysis of how these laws apply to social media, see our guide on online and social media defamation in Thailand. For all available legal defences and landmark court rulings, see our article on defamation defences and Supreme Court decisions. If you are a foreigner facing defamation charges, read our practical guide for foreigners facing defamation in Thailand.

The Thai legal system’s approach to defamation reflects deep cultural values around reputation, social harmony, and respect. However, this creates a legal minefield for foreigners accustomed to broader freedom of expression rights. Between 2015 and 2021, more than 25,000 defamation cases have been filed. Many of these cases target expatriates and social media users. These laws can be used as a weapon against critics, whistleblowers, and anyone who speaks out against powerful interests.

Understanding the defamation laws in Thailand: is essential for anyone engaging in public discourse. Many expatriates have faced severe repercussions due to misunderstandings about these laws.

1. Legislative History of Defamation in Thailand

The Penal Law of R.S. 127 (B.E. 2451 / 1908)

Thailand’s earliest codified defamation provisions appeared in the Penal Law of R.S. 127 (B.E. 2451). This law was promulgated in 1908 during King Chulalongkorn’s reign. The code was heavily influenced by European civil law traditions, particularly French and Japanese models. It introduced the concept of criminal liability for injuring another person’s reputation.

Defamation was already treated as a criminal matter in this early code. This reflected the Thai legal tradition of protecting personal honour through penal sanctions rather than purely civil remedies.

The Criminal Code B.E. 2499 (1956)

In 1956, King Bhumibol Adulyadej signed into law the Criminal Code B.E. 2499. It came into force on 1 January 1957. This code replaced the 1908 Penal Law and consolidated all criminal provisions into a single statute.

The defamation provisions were codified in Sections 326 through 333 of Book 2, Title 12, under the heading “Offences Relating to Liberty and Reputation.” The drafters drew upon continental European legal models and adapted them to Thai social values. Personal reputation and face (หน้าตา) carry significant weight in Thai daily life. The dual approach of criminalising defamation while also providing civil remedies was a deliberate legislative choice.

Penal Code (No. 11) Amendment Act B.E. 2535 (1992)

The most significant amendment to the defamation provisions came with the Penal Code (No. 11) Amendment Act B.E. 2535 (1992). This amendment revised Section 326 by adjusting the penalties and refining the elements of the offence. Cases committed before the enforcement date continued to be prosecuted under the original text of Section 326.

The Computer Crime Act B.E. 2550 (2007) and Its 2017 Amendment

The rise of the internet prompted the enactment of the Computer Crime Act B.E. 2550 (2007). This Act created a parallel track of liability for online statements. It was significantly amended in 2017, broadening its scope and increasing penalties. For a full analysis, see our guide on online and social media defamation in Thailand.

Criminal Procedure Code Amendments (2019)

In 2019, the Thai government amended the Criminal Procedure Code (CPC) to address frivolous defamation suits. Section 161/1 now empowers courts to dismiss complaints filed in bad faith or with intent to harass. Section 165/2 allows defendants to submit evidence at the preliminary hearing stage. These anti-SLAPP provisions are analysed in detail in our article on defamation defences and Supreme Court decisions.

2. Criminal Defamation: Sections 326 to 333 of the Criminal Code

The core of Thai defamation law sits in Sections 326 through 333 of the Criminal Code B.E. 2499. These eight sections establish the offences, penalties, defences, and procedural rules that govern criminal defamation.

Section 326: Simple Defamation (หมิ่นประมาท)

Section 326 is the foundation of criminal defamation in Thailand. It provides:

“Whoever imputes anything to the other person before a third person in a manner likely to impair the reputation of such other person or to expose such other person to be hated or scorned, is said to commit defamation, and shall be punished with imprisonment not exceeding one year or fined not exceeding twenty thousand Baht, or both.”

Three elements must be proven for a conviction under Section 326:

1. An imputation: a statement attributing something to the victim.
2. Communication before a third person: the statement must be conveyed to at least one person other than the victim.
3. Likelihood of reputational harm: the statement must be likely to damage the victim’s reputation or subject them to hatred or contempt.

The prosecution does not need to prove that actual harm occurred. The mere likelihood is sufficient. The accused does not need to intend harm. Even unintentional statements can constitute defamation if they damage reputation.

Section 327: Defamation of the Deceased

Section 327 extends defamation protection beyond death. Imputing anything to a deceased person is punishable under the same penalties as Section 326 when the imputation is likely to impair the reputation of the father, mother, spouse, or child of the deceased. This reflects the Thai cultural concept that a person’s reputation extends to their family.

Section 328: Defamation by Publication (Libel)

Section 328 creates an aggravated offence for statements made through publication or broadcast:

“If the offence of defamation be committed by means of publication of a document, drawing, painting, cinematograph film, picture, or letters made visible by any means, recording tape, or recording picture, or broadcasting or spreading the picture, or by any other means, the offender shall be punished with imprisonment not exceeding two years and fined not exceeding two hundred thousand Baht.”

Thai courts have consistently held that social media posts, blog entries, and online comments qualify as “publication” under Section 328. The penalties are harsher than Section 326: up to two years’ imprisonment and a fine of up to 200,000 Baht. For Section 328, imprisonment and fine are cumulative. The court must impose both.

Section 329: Statutory Defences

Section 329 provides four categories of protected expression when statements are made in good faith. These include self-justification, official functions, fair comment on public matters, and fair reporting of court proceedings. For a full analysis with Supreme Court interpretations, see our dedicated guide on defamation defences in Thailand.

Section 330: The Truth Defence

Section 330 permits a defendant to prove the truth of a defamatory imputation. However, this defence only works if the imputation relates to a matter of public interest. Truthful statements about purely private matters remain actionable. This is a critical distinction from common law jurisdictions where truth is generally an absolute defence.

Section 331: Privilege for Court Proceedings

Section 331 provides absolute privilege for statements made by parties or their lawyers during court proceedings. Any opinion expressed in court in favour of a party’s case shall not give rise to defamation liability.

Section 332: Court Orders Upon Conviction

Section 332 empowers the court to order the seizure and destruction of defamatory material. The court may also order publication of its judgment at the convicted person’s expense.

Section 333: Compoundable Offence

Section 333 classifies defamation as a compoundable offence (ความผิดอันยอมความได้). The case can only be initiated through a private complaint by the injured party. The State cannot prosecute on its own. If the injured person dies, the right passes to the father, mother, spouse, or child of the deceased. Parties may also settle and withdraw the complaint at any stage.

3. Civil Defamation: Sections 420 and 423 of the Civil and Commercial Code

Thai law also provides a civil remedy for defamation under the Civil and Commercial Code (CCC). Victims may pursue monetary compensation without criminal prosecution. They may also pursue both tracks simultaneously.

Section 420: General Tort Liability

Section 420 establishes the general framework for wrongful acts (ละเมิด):

“A person who, wilfully or negligently, unlawfully injures the life, body, health, liberty, property or any right of another person, is said to commit a wrongful act and is bound to make compensation therefor.”

Defamation constitutes an injury to a person’s right to reputation. It can ground a civil claim under Section 420.

Section 423: Defamation-Specific Tort

Section 423 provides a more targeted basis for civil defamation:

“A person who, contrary to the truth, asserts or circulates as a fact that which is injurious to the reputation or the credit of another or his earnings or prosperity in any other manner, shall compensate the other for any damage arising therefrom, even if he does not know of its untruth, provided he ought to know it.”

Unlike criminal defamation, Section 423 focuses on false statements and requires proof of actual damage. It also introduces a negligence standard. The defendant is liable even if they did not know the statement was false, provided they ought to have known.

Limitation Periods

Civil defamation claims must be filed within one year of discovering the defamatory act and the offender’s identity. The alternative deadline is ten years from the date of the wrongful act. Whichever expires first applies.

Damages

There is no statutory cap on damages. Courts have discretion to award amounts proportionate to the severity of the defamation. Awards in the hundreds of thousands and even millions of Baht have been granted in high-profile cases.

4. Criminal vs. Civil Defamation: Thailand’s Dual Legal System

Thailand operates a dual system where defamation can trigger both criminal and civil proceedings simultaneously. This creates a harsh situation for defendants. They may face imprisonment in criminal courts and also be sued for money in civil courts at the same time.

Criminal defamation penalties include up to one year in prison and fines of 20,000 Baht for basic defamation under Section 326. For published defamation under Section 328, penalties increase to two years and 200,000 Baht. The criminal system allows any injured party to file complaints directly with the police or courts. This gives private individuals the power to start criminal cases.

Civil defamation under Section 423 of the CCC focuses on monetary compensation. Victims must prove that false statements caused actual financial or reputational harm. The civil track has a one-year limitation period. This starts when the victim learns of the defamation and identifies the offender.

The dual system means that a single defamatory statement can expose the defendant to both imprisonment and financial damages. Charges under the Computer Crime Act can add further penalties on top of both tracks.

5. The Computer Crime Act and Online Defamation

The Computer Crime Act B.E. 2550 (2007), as amended in 2017, creates additional criminal liability for online statements. It is frequently used alongside traditional defamation charges.

Section 14(1): False Computer Data

Section 14(1) criminalises the entry of false data into a computer system likely to cause damage to a third party or the public. The penalty is imprisonment of up to five years and/or a fine of up to 100,000 Baht.

Section 16: Defamation by Image

Section 16 targets the uploading of manipulated images that cause defamation. The penalty is up to three years’ imprisonment and/or a fine of 60,000 Baht.

Charge Stacking

Prosecutors routinely stack charges from multiple statutes for a single online post. A single Facebook comment could result in charges under Section 328 (up to 2 years), Section 14(1) (up to 5 years), and Section 16 (up to 3 years). The theoretical maximum exposure for one post can reach ten years or more.

For a complete analysis of platform-specific risks, the 24-hour takedown obligation, forum shopping, and intermediary liability, see our dedicated guide on online and social media defamation in Thailand.

6. Royal Defamation: Lese-Majeste under Section 112

Section 112 of the Criminal Code provides:

“Whoever defames, insults, or threatens the King, the Queen, the Heir-apparent, or the Regent, shall be punished with imprisonment of three to fifteen years.”

Lese-majeste is entirely separate from ordinary defamation. Unlike Sections 326 to 333, Section 112 is a non-compoundable offence. The State can prosecute without a private complaint. The parties cannot settle. Any person may file a complaint.

The penalties are severe: 3 to 15 years’ imprisonment with no option for a fine alone. Sentences often run consecutively, not concurrently. Courts have interpreted the provision broadly. This includes references to deceased monarchs and royal family members not specifically named in the statute. Even indirect references, sarcastic comments, or sharing content deemed offensive can result in prosecution.

Enforcement has increased significantly since 2020. As of September 2024, more than 270 people are facing 301 lese-majeste cases. Courts routinely deny bail for lese-majeste defendants. The case of Mongkol Thirakhot is a stark example. He received a record 50-year sentence for Facebook posts.

Foreigners can be charged for content created outside Thailand. American scholar Paul Chambers faced charges in 2025 before prosecutors dismissed the case in May 2025. This is not a subject area where foreigners should take any risks. For more on how foreigners are affected, see our practical guide for foreigners facing defamation charges.

7. Enforcement Trends and Statistics

Criminal defamation prosecutions in Thailand have been on an upward trend. According to ARTICLE 19, cases submitted to Courts of First Instance increased from 1,386 in 2015 to 2,023 in 2019. That is a 50% rise in five years. Over 25,000 defamation cases have been filed since 2015.

Between January 2015 and September 2020, there were 8,397 convictions. This represents a conviction rate of approximately 83 percent. Courts convict in the vast majority of cases that proceed to trial.

Approximately 58% of complaints are filed by government officials or politicians. Around 41% target human rights defenders and activists. This pattern shows strategic use of defamation laws to silence critics.

Political prosecutions have increased since the 2020 democracy protests. As of September 2024, 1,959 people have been prosecuted in 1,305 political cases. This includes 274 individuals facing lese-majeste charges and 206 people charged under the Computer Crime Act.

Social media platforms such as Facebook, LINE, Twitter (X), Instagram, and YouTube have become the primary source of defamation complaints. The criminal trial procedures in Thailand are formal and can extend over many months. Early legal intervention is essential.

8. International Pressure and Reform Proposals

Thailand’s criminal defamation regime has drawn sustained criticism from international human rights organisations. ARTICLE 19 published “Truth Be Told: Criminal Defamation in Thai Law and the Case for Reform” in 2021. It concluded that criminal defamation provisions are incompatible with international human rights standards.

The United Nations Human Rights Committee, in General Comment No. 34, urged all states to consider decriminalising defamation. It stated that custodial sentences are never appropriate punishment for defamation. The International Commission of Jurists has similarly called on Thailand to stop using criminal law to inhibit freedom of expression.

The global trend toward decriminalisation provides momentum for reform. Most democratic countries have shifted to civil-only remedies. However, meaningful reform in Thailand has not materialised. The 2019 CPC anti-SLAPP amendments represent incremental progress. The core criminal provisions remain unchanged since 1992.

For anyone living, working, or creating content in Thailand, the law must be navigated as it stands today.

FAQS about Defamation in Thailand

Conclusion: Navigating Thailand’s Legal Landscape

Whether you are a potential complainant or defendant, early legal advice is the most important step you can take. Thai defamation law is complex. It involves overlapping criminal and civil tracks, the Computer Crime Act, and nuanced defences.

At ThaiLawOnline, our team has over 30 years of combined experience in Thai criminal law and civil litigation. We advise expatriates, businesses, content creators, and media organisations on all aspects of defamation law.

If you are facing defamation charges or considering filing a complaint, book an online consultation with a Thai lawyer who understands both the legal framework and the practical realities.

You can also visit our legal services in Bangkok page or contact us directly for urgent matters.

• Article 19 on Defamation laws in Thailand
• Free Guide and 10 tips to Avoid Defamation in Thailand by ThaiLawOnline