A valid passport is required to enter the Kingdom of Thailand. Generally, a foreign citizen who wishes to enter Thailand is required to obtain a visa from a Royal Thai Embassy or a Royal Thai Consulate-General. However, nationals of certain countries do not require a visa if they meet visa exemption requirements. Please refer to Summary of Countries and Territories entitled for Visa Exemption and Visa on Arrival to Thailand.
For details, please visit the official web site of the Ministry of Foreign Affairs, Kingdom of Thailand or contact the Royal Thai Embassy / Consulate-General in your country.