Thailand is a unitary state, which means the territories are separated into central co-dependencies, with the central government deciding everything for the provinces. The kingdom is separated into multiple levels including regions, provinces, and many more. Though, formally, Thailand is separated into three levels: provinces, districts, and sub-districts, there are also informal divisions such as parimonthon, and phak. Furthermore, there are administrative divisions of the same level with different names such as the first-level divisions of the province and the special administrative region.

The Ministry of Interior of the Kingdom of Thailand is a cabinet-level department in the Government of Thailand. The ministry has wide ranging responsibilities. It is responsible for local administration, internal security, citizenship, disaster management, road safety, land management, issuance of national identity cards, and public works. The ministry is responsible for appointing the 76 governors of the Provinces of Thailand. The Minister of Interior is the head of the ministry. He is appointed by the King of Thailand on the recommendation of the prime minister. Since 1 September 2023, the head of the ministry has been Anutin Charnvirakul. He is aided by two deputy ministers. The FY2019 budget of the ministry is 371,802 million baht.