Thai Court Language: English Interpretation Rules

TL;DR

Thai court proceedings are in Thai language only per Civil Procedure Code B.E. 2477 (1934) §46. Non-Thai-speaking parties and witnesses have a right to interpretation — by court-appointed interpreter (free in criminal cases) or party-paid interpreter (civil). All written pleadings, evidence, and judgments are in Thai; foreign-language documents need sworn translation. Quality of interpretation varies; complex commercial cases commonly require pre-engagement of an expert interpreter.

Interpretation Modes

Sworn Translation of Documents

• Foreign-language documents require Thai translation by a recognised translator.
• Common bodies: Ministry of Foreign Affairs, registered translation companies, court-listed translators.
• Cost: THB 250-500 per A4 page; expedited service surcharged.

Court Etiquette for Foreigners

• Stand when the court enters / departs.
• Address judges as "Your Honour" (or via interpreter).
• Speak slowly to aid interpretation accuracy.
• Bring a back-up interpreter for high-stakes hearings.

Common Mistakes

• Relying on a friend's informal translation in court.
• Submitting English documents without sworn translation.
• Speaking too fast during testimony — interpreter accuracy suffers.
• Failing to verify court-appointed interpreter's subject-matter expertise.

FAQs

1. Can I use AI translation?

AI / app translation is not court-recognised for evidence or official record. Sworn translation by a recognised translator is required.

2. Does the embassy interpret?

Embassies do not provide court interpretation. Some maintain translator lists.

Why Language Matters in a Thai Court

Thai is the official language of the courts. Every pleading, item of documentary evidence, and the judgment itself is in Thai, and oral testimony is given and recorded in Thai. A party or witness who does not speak Thai is entitled to the assistance of an interpreter so they can understand and participate — in criminal cases especially, providing interpretation for an accused who cannot follow the proceedings is treated as a basic fair-trial safeguard. In civil matters the parties usually arrange and pay for their own interpreter, and choosing someone with the right subject-matter vocabulary (commercial, technical, medical) materially affects how accurately testimony is captured.

Getting Foreign Documents Admitted

Foreign-language documents cannot simply be handed up in English. They must be translated into Thai, and the court and opposing side may scrutinise the translation's accuracy, so a competent certified translation is worth the cost. For documents executed abroad, parties often also need notarisation and legalisation (via the Ministry of Foreign Affairs and, where relevant, the issuing country's authorities) before the Thai court will give them full weight. The recurring mistakes are relying on an informal or app translation, underestimating how long good translation takes, and speaking too quickly during testimony for the interpreter to keep pace.

Related Reading

• Self-Represent in Civil Court
• Court Procedure Hub