Defamation & the Computer Crime Act, in outline

Many foreigners assume a bad online review or a heated social-media post is, at worst, something you could be sued for civilly. In Thailand, the same conduct can also be a criminal offence — and that surprises people at exactly the wrong moment.

Defamation is criminal in Thailand

• Thailand’s Criminal Code makes defamation — broadly, exposing someone to hatred or contempt, or damaging their reputation, through a statement made to a third party — a criminal offence, not just a civil wrong.
• Truth is a defence in some, but not all, circumstances — Thai defamation law does not treat “but it’s true” as an automatic shield the way some other legal systems do.
• Publication online, including social media posts, messaging-app groups and online reviews, generally counts as publication for defamation purposes, and can trigger a harsher penalty tier than an equivalent spoken statement.
• A defamation case can be pursued as a private criminal prosecution by the person defamed, without needing the police or a public prosecutor to initiate it.

The Computer Crime Act

Separately from defamation, the Computer Crime Act creates offences around inputting false data into a computer system in a way likely to cause damage or public alarm, among other computer-related offences aimed originally at hacking and fraud. In practice, it is frequently charged alongside defamation for the same online post, effectively stacking two sets of criminal exposure onto a single piece of content. Businesses and individuals responding to negative reviews, and reviewers themselves, should understand both laws can apply to the same post at once.

Online reviews and consumer complaints

A genuine, factual account of a bad experience with a business is different, legally, from an exaggerated or knowingly false claim — but the line between the two is exactly where many disputes land, and Thai defamation law gives businesses a real route to challenge reviews they consider unfair, including criminally. If you are posting about a dispute with a business, stick to verifiable facts, avoid characterising motives or making claims you cannot support, and understand that even a factual account can still attract a claim you will need to defend.

If you are threatened with, or facing, a defamation or Computer Crime Act complaint

• Do not delete the post or evidence — preserve everything, including message threads and screenshots, which may matter for your own defence.
• Do not assume an apology or a deleted post resolves a criminal complaint already filed — it may help, but the process itself continues independently.
• Get a lawyer involved promptly; see criminal matters for the general shape of a criminal case from this point.

If you are considering filing a complaint

Filing a criminal defamation or Computer Crime Act complaint is a serious step with real consequences for the other party, not a quick fix for a bad review — and a complaint found to be filed in bad faith, or that fails, can itself expose the complainant to costs or countersuit risk in some circumstances. A civil claim for damages, or a straightforward request that content be corrected or removed, is sometimes the more proportionate first step; discuss the realistic options with a lawyer before filing anything.