The 13th Grand National Assembly of Turkey existed from 10 October 1965 to 12 October 1969. There were 456 MPs in the lower house. The majority of the MPs were the members of Justice Party (AP). The main opposition Party was the Republican People's Party (CHP). Other parties were the Nation Party (MP), the New Turkey Party (YTP), the Workers Party (TİP), and the Republican Villagers Nation Party (CKMP).