The Parliament House of Thailand was a building which housed the National Assembly, the legislative branch of the Government of Thailand from 1974 to 2018. The legislature is a bicameral body, consisting of two chambers: the upper house, and the lower house. The Parliament House of Thailand is in the Dusit District of the capital, Bangkok. In 2019 the legislature moved into a new building named the Sappaya-Sapasathan, which became the new parliament house.

The Government of Thailand, or formally the Royal Thai Government, is the unitary government of the Kingdom of Thailand. The country emerged as a modern nation state after the foundation of the Chakri Dynasty and the city of Bangkok in 1782. The Revolution of 1932 brought an end to absolute monarchy and replaced it with a constitutional monarchy.