Section 68 — Lawful self-defence
English translation
Whoever must commit any act in order to defend his own right, or another person's right, against an imminent danger arising from an unlawful attack, and does so reasonably under the circumstances, commits a lawful defence and is not guilty of any offence.
This English translation is provided for reference only and has not yet been firm-verified — always rely on the Thai original.
Firm annotation
Section 68 is the self-defence provision in Book 1 and, unlike necessity in Section 67, is a full justification: the defender is not guilty of any offence. Its elements are an imminent danger, arising from an unlawful attack, threatening the defender's own or another's rights, met by an act that is necessary and reasonable in proportion to the threat. The requirement of an unlawful attack distinguishes it from necessity, which may respond to danger from any source. Two limits recur in the case law: the defender must not have provoked the confrontation or willingly entered a mutual affray, and the defensive act must be intentional, because a negligent or accidental act cannot constitute lawful defence. Where the response exceeds what is reasonable, Section 69 governs and allows reduction or, in cases of fright or fear, no punishment.
Why this matters in practice
Section 68 is the strongest exculpatory plea available in a violent-incident case because it results in acquittal, not just a lighter sentence, and it extends to defending another person, not only oneself. Success turns on proving the attack was unlawful and imminent and that the response was proportionate; a single reasonable blow to repel an attack is very different from a sustained or repeated response. Two pitfalls defeat the plea: entering a mutual fight voluntarily, and relying on an act that was in fact accidental or negligent. Because the line between lawful defence and excessive defence under Section 69 often decides the case, close factual preparation with a Thai criminal lawyer is essential.
Supreme Court decisions interpreting this section
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Supreme Court Judgment No. 4292/2567 (2024)
A single, proportionate blow to protect another person from an imminent unlawful attack is lawful defence under Section 68 and not an offence.
The defendant punched the victim once to defend his wife from an attack and did not strike again after the victim fell. The Court held this was defence that was reasonable and not excessive, so it was lawful defence under Section 68 and not an offence.
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Supreme Court Judgment No. 4328/2565 (2022)
A person who voluntarily enters a mutual quarrel cannot claim lawful self-defence under Section 68, even if the other side damaged his property first.
The Court found the defendant had willingly entered a fight with the two deceased and intentionally stabbed them, so even though they had struck and kicked his car first, he could not claim lawful defence under Section 68.
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Supreme Court Judgment No. 1597/2562 (2019)
Lawful defence under Section 68 requires an intentional act; a negligent or accidental act cannot amount to lawful self-defence.
The defendant fired a warning shot and, during a struggle, the gun discharged, striking the deceased. The Court held that because the fatal shots were fired negligently and not intentionally, the act could not be lawful defence under Section 68.
Curated decisions with case numbers verified against the Supreme Court database. English renderings are the firm's editorial translation for study.
Frequently asked questions
When is self-defence lawful in Thailand?
Under Section 68, when you act to defend your own or another's right against an imminent danger from an unlawful attack and your response is reasonable in the circumstances. If so, you commit no offence at all.
Can I claim self-defence if I entered a fight willingly?
Generally no. Where a person voluntarily enters a mutual affray, the courts hold that Section 68 lawful defence cannot be invoked, even if the other side struck or damaged property first.
Does an accidental act count as self-defence?
No. Lawful defence under Section 68 requires an intentional act. An act that was in fact negligent or accidental, such as a gun discharging during a struggle, cannot be lawful self-defence.