- Since 1932 the head of government of Thailand has been the Prime Minister of Thailand, usually the leader of the largest party or the largest coalition party in the lower house of parliament.
- The prime minister is, in accordance with the constitution, selected, first by an election in the lower house, then officially appointed by the King.
- The prime minister, as head of the executive branch, is also the leader of the Cabinet of Thailand. The prime minister therefore retains the prerogative to appoint or remove any minister he or she so chooses.