Penal Code

Section 52: Reduction of the death penalty

Statutory text (Thai original)

ในการลดโทษประหารชีวิต ไม่ว่าจะเป็นการลดมาตราส่วนโทษหรือลดโทษที่จะลง ให้ลดดังต่อไปนี้ (๑) ถ้าจะลดหนึ่งในสามให้ลดเป็นโทษจำคุกตลอดชีวิต (๒) ถ้าจะลดกึ่งหนึ่ง ให้ลดเป็นโทษจำคุกตลอดชีวิต หรือโทษจำคุกตั้งแต่ยี่สิบห้าปีถึงห้าสิบปี

English translation

In reducing the death penalty, whether it is a reduction of the scale of punishment or a reduction of the punishment to be imposed, the reduction shall be as follows:
(1) if the reduction is by one-third, it shall be reduced to imprisonment for life;
(2) if the reduction is by one-half, it shall be reduced to imprisonment for life or imprisonment from twenty-five years to fifty years.

This English translation is provided for reference only and has not yet been firm-verified. Always rely on the Thai original.

Firm annotation

Section 52 translates a percentage reduction of the death penalty into a defined term, since death cannot be expressed as a fraction. It covers both reduction of the scale of punishment and reduction of the punishment to be imposed. A one-third reduction yields imprisonment for life; a one-half reduction yields either imprisonment for life or a term of twenty-five to fifty years, giving the court a range at the halfway level. It works with Section 53 (reduction of life imprisonment) and Section 54 (order of calculating increases and reductions), and is commonly applied together with the general mitigation reduction in Section 78.

Why this matters in practice

For a capital defendant, a mitigating factor such as a useful confession can be the difference between death and a term of years, because Section 52 converts the reduction into life imprisonment or, at the half level, a term as low as twenty-five years. The choice within the twenty-five to fifty year range on a one-half reduction is the court's, so mitigation submissions still matter after death is off the table. In the most serious cases, early and careful defense preparation is essential; consider speaking with a Thai lawyer.

Supreme Court decisions interpreting this section

  1. Supreme Court Judgment No. 2585/2568 (2025)

    Where the court of first instance sentences a defendant to imprisonment for life, section 245 paragraph two of the Criminal Procedure Code makes that judgment not final unless the Court of Appeal affirms it. So even where the defendant appeals only against the severity of the sentence, the Court of Appeal must first consider and decide whether he committed the offence at all.

    The court of first instance sentenced the first defendant to imprisonment for life for joint murder, and he appealed only asking for a lighter sentence. The Court of Appeal Region 7 considered only that ground. The Supreme Court held that unlawful: under section 245 paragraph two of the Criminal Procedure Code the Court of Appeal had to decide whether he committed the offence at all before the judgment could become final. Taking the point of its own motion as one of public order, it set aside the judgment of the Court of Appeal Region 7 and sent the case back for a fresh judgment. It made no ruling on any reduction of punishment under Section 52.

  2. Supreme Court Judgment No. 2813/2568 (2025)

    Premeditated murder under Section 289(4) carries the death penalty only, and an attempt is punished at two-thirds of it; reducing the death penalty by one-third under Section 52(1) leaves imprisonment for life.

    The court explained that premeditated murder under Section 289(4) carries the death penalty only and an attempt is punished at two-thirds of it. Reducing the death penalty by one-third under Section 52(1) leaves imprisonment for life, which the lower courts then halved under Section 78 to twenty-five years.

  3. Supreme Court Judgment No. 6190/2567 (2024)

    Section 52 governs the reduction of a death penalty. Where the court finds the offence is murder under Section 288 and imposes imprisonment for life, a reduction by one half is made under Section 53, not Section 52, and leaves twenty-five years.

    The lower courts had convicted of premeditated murder committed with torture or cruelty and imposed the death penalty, reduced by one half for the confession. The Supreme Court held there was no evidence of premeditation, the stabbing having happened suddenly, and dealt with the torture and cruelty limb of its own motion as a question of public order. It varied the judgment to a conviction for murder under Section 288, imposed imprisonment for life, and reduced that by one half under Section 78 read with Section 53, leaving twenty-five years. Section 52 (2) was not applied.

Curated decisions with case numbers verified against the Supreme Court database. English renderings are the firm's editorial translation for study.

Cited in 520 Supreme Court decisions (1966 to 2026)

Selected citing decisions

  • Decision 6190/2567 (2024)
  • Decision 179/2565 (2022)
  • Decision 4394/2563 (2020)
  • Decision 4976/2562 (2019)
  • Decision 4623/2562 (2019)
  • Decision 8929/2561 (2018)
  • Decision 6930/2561 (2018)
  • Decision 6768/2561 (2018)

This list is selected automatically, weighted towards judgments that turn on this section rather than ones that merely recite it when passing sentence. It has not yet been reviewed by the firm.

Most often cited alongside

Sections that appear in the same judgments as this one most often. The figure is the number of decisions.

Counted across the firm's corpus of 83,652 Supreme Court decisions, 1921 to 2026. The count is complete; the stated year range trims rare outliers so it describes where the citations actually sit. These figures are computed by us and are not official court statistics. How we count these, and what we measured

Frequently asked questions

How is the death penalty reduced in Thailand?

Under Section 52, a one-third reduction of the death penalty becomes imprisonment for life, and a one-half reduction becomes imprisonment for life or a term of twenty-five to fifty years.

Does a guilty plea help in a capital case?

It can. A mitigating reduction such as one for confession, applied through Section 78 with Section 52, converts the death penalty into life imprisonment or a defined term of years.

Related guides on ThaiLawOnline

Cite this section

  • Plain citation Penal Code, s. 52 (Thailand)
  • Academic citation Penal Code (Thailand), s. 52. ThaiLawOnline, https://www.thailawonline.com/thai-penal-code/section-52/ (accessed 21 August 2026).
  • Thai citation ป.อ. มาตรา 52
  • Permalink https://www.thailawonline.com/thai-penal-code/section-52/
  • Embed on your site <blockquote cite="https://www.thailawonline.com/thai-penal-code/section-52/"><p>In reducing the death penalty, whether it is a reduction of the scale of punishment or a reduction of the punishment to be imposed, the reduction shall be as follows: (1) if the reduction is by one-third, it shall be reduced to imprisonment for life;…</p><footer>Penal Code, s. 52 (Thailand) — <a href="https://www.thailawonline.com/thai-penal-code/section-52/">ThaiLawOnline</a></footer></blockquote>

The Thai text is authoritative. The English is an unofficial translation by ThaiLawOnline, free to reuse with attribution.

This is educational reference, not legal advice. Consult a qualified Thai lawyer before relying on any provision.

Scroll to Top
WhatsApp LINE Call Book