Thailand Defamation Laws: Criminal & Civil

Defamation in Thailand is primarily a criminal offence under Sections 326 to 333 of the Penal Code, and it can also support a separate civil claim for damages. Online cases can additionally engage the Computer Crime Act. The country's lese-majeste rule (Section 112) is a distinct, more severe offence and is addressed separately below.

What counts as defamation in Thailand

Defamation in Thailand is defined in Section 326 of the Penal Code as imputing anything to another person before a third person in a manner likely to impair that person's reputation or to expose them to hatred or contempt. The offence therefore needs a statement communicated to at least one other person that is capable of damaging the target's standing. Section 327 extends protection to imputations against a deceased person where the imputation is likely to harm the reputation of the deceased's father, mother, spouse, or child. Thai defamation does not require the statement to be in writing; spoken defamation is covered, while Section 328 adds a heavier penalty when defamation is committed by publication. Both individuals and juristic persons such as companies can be defamed and can act as complainants.

Criminal defamation and penalties

Thailand's defamation offences are set out in the Penal Code, and most enforcement is criminal rather than civil. The base offence and the aggravated publication offence carry the penalties below.

Most prosecutions proceed under Section 328 because allegedly defamatory material is typically published in print, in broadcasts, or on the internet. Press-freedom and human-rights monitors have for years called on Thailand to decriminalise defamation, noting that complainants, including companies, sometimes use criminal complaints in response to critical reporting or consumer reviews.

The defences

Thailand recognises defined statutory defences. Section 329 provides that a person is not guilty of defamation if, in good faith, they express an opinion or statement by way of self-justification or defence, or to protect a legitimate interest, in fair comment on a matter that is the subject of public criticism, or in reporting court or official proceedings in good faith. Section 330 addresses truth: if the accused proves that the imputation is true, they are not punished, but proof of truth is not allowed, and the defence is unavailable, where the imputation concerns a purely private matter and the proof would not benefit the public. Truth alone is therefore not a complete shield in Thailand; it must generally be coupled with public benefit. Section 331 protects parties and their lawyers expressing opinions in court proceedings.

Watch out: Unlike many common-law systems, truth by itself is not a full defence in Thailand. Under Section 330, the accused must show both that the statement is true and that proving it serves the public benefit, and proof is barred for purely private matters.

Remedies, damages and the civil claim

Alongside the criminal route, a defamed person can bring a civil action for wrongful acts under the Civil and Commercial Code, which allows compensation for injury to reputation, and a court can order the defendant to take suitable measures to restore the claimant's reputation, such as publishing a correction. Civil damages are assessed on the harm shown and are not subject to a fixed statutory cap. In a criminal case, Section 332 allows the court, on convicting for defamation by publication, to order seizure and destruction of the defamatory material and publication of all or part of the judgment in newspapers at the convicted person's expense. A complainant may also pursue compensation within the criminal case. The penalty in a criminal case is imprisonment or a fine, while the civil action targets monetary compensation.

Limitation period and complaint deadline

Defamation under the Penal Code is a compoundable offence, which means it is prosecuted on the complaint of the injured person and can be settled between the parties. Section 333 provides that defamation offences are offences that can only be prosecuted upon complaint. Because of this, the injured person must lodge a criminal complaint within three months from the date they learn of the offence and the identity of the offender; missing that window extinguishes the right to prosecute. For a civil claim for a wrongful act, the Civil and Commercial Code generally sets a one-year limitation period running from when the injured person knew of the wrongful act and the person bound to make compensation, so prompt action matters on both tracks.

Online defamation and the Computer Crime Act

Online and social-media defamation is commonly charged under Section 328 of the Penal Code as defamation by means of publication, since posts reach third parties. The Computer Crime Act, as amended in 2017, separately penalises importing into a computer system false or distorted computer data likely to cause damage, but its key fake-data provision (Section 14) is expressly drafted to exclude conduct that constitutes Penal Code defamation, so a pure reputational attack should be prosecuted as defamation rather than under that provision. In practice, complainants have nonetheless sometimes added Computer Crime Act charges to online defamation cases, a pattern criticised by free-expression monitors. The Act also addresses intermediary and service-provider responsibilities for unlawful content.

Watch out: The Computer Crime Act and Penal Code defamation are distinct. Section 14 of the Computer Crime Act targets false computer data and, by its terms, does not apply where the conduct is defamation under the Penal Code, although charges are sometimes brought together in online cases.

Lese-majeste: a separate offence

Thailand also has a lese-majeste offence in Section 112 of the Penal Code, which provides that 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. This is a separate and significantly more severe offence than the ordinary defamation in Sections 326 to 333, it concerns only the specified members of the monarchy, and it is treated by prosecutors as a national-security matter rather than a private reputation dispute. United Nations experts and press-freedom organisations have repeatedly raised concerns about its scope and penalties. It is mentioned here only to distinguish it from ordinary defamation, which is what this page covers.

How a claim is brought

For criminal defamation, the injured person can file a private criminal complaint directly with the court or report the matter to the police, who may refer it to the public prosecutor; because defamation is compoundable, the case can be withdrawn or settled. The complaint must be lodged within three months of learning of the offence and the offender. For a civil claim, the injured person files a wrongful-act suit seeking damages and reputation-restoring measures, subject to the one-year limitation period. Many disputes begin with a demand letter seeking an apology, correction, and compensation before formal proceedings start.

Frequently Asked Questions

Is defamation a crime in Thailand?

Yes. Defamation in Thailand is a criminal offence under Sections 326 to 333 of the Penal Code. The base offence carries up to one year imprisonment or a fine up to 20,000 baht, and defamation by publication under Section 328 carries up to two years and a fine up to 200,000 baht. It can also support a civil claim.

What is the penalty for criminal defamation in Thailand?

Under Section 326, ordinary defamation is punishable by up to one year imprisonment or a fine up to 20,000 baht, or both. Under Section 328, defamation by means of publication, including online, carries up to two years imprisonment and a fine up to 200,000 baht.

Is truth a defence to defamation in Thailand?

Not on its own. Under Section 330, the accused must prove both that the statement is true and that proving it serves the public benefit. Proof of truth is barred, and the defence is unavailable, where the imputation concerns a purely private matter.

How long do you have to file a defamation case in Thailand?

Defamation is a complaint-based, compoundable offence, so the injured person must lodge a criminal complaint within three months of learning of the offence and the offender. A civil wrongful-act claim is generally subject to a one-year limitation period.

Is online defamation illegal in Thailand?

Yes. Online posts are typically charged under Section 328 as defamation by means of publication. The Computer Crime Act addresses false computer data, but its Section 14 expressly excludes conduct that is Penal Code defamation, so reputational attacks are meant to be charged as defamation.

Can you sue for defamation damages in Thailand?

Yes. Alongside the criminal route, a defamed person can bring a civil wrongful-act claim under the Civil and Commercial Code for compensation and reputation-restoring measures such as a published correction. Civil damages are assessed on the harm shown and are not capped by statute.

What is lese-majeste and how is it different from defamation?

Lese-majeste under Section 112 of the Penal Code punishes defaming, insulting, or threatening the King, Queen, Heir-apparent, or Regent with three to fifteen years imprisonment. It is a separate, more severe offence concerning the monarchy and is distinct from ordinary defamation in Sections 326 to 333.

Can a company sue for defamation in Thailand?

Yes. Juristic persons such as companies can be defamed and can act as complainants. Press-freedom monitors note that criminal defamation complaints are sometimes brought by companies against critical reviews or reporting, which is part of the case for reform.