The Office of the Prime Minister (Abrv: OPM; Thai: สำนักนายกรัฐมนตรี, RTGS: Samnak Nayok Ratthamontri) is the central executive agency in the Government of the Kingdom of Thailand. It is classified as a cabinet department and is led by a permanent secretary. Its main responsibility is to assist the Prime Minister of Thailand in the role of head of government and chair of the Cabinet of Thailand.