Republic Museum (also known as "Second parliament Building of Turkey", Turkish: Cumhuriyet Müzesi) is a museum in Ankara, Turkey, which was the Turkish Parliament building from 1924 to 1960.

The former Turkish Parliament building (now the War of Independence Museum) which was used during the Turkish War of Independence, was actually a branch office building of the Ottoman era-Committee of Union and Progress.

After 1960, the building served as the CENTO (Central Treaty Organization) headquarters.

The museum was opened on 30 September 1981 in the 100th birth year of Mustafa Kemal Atatürk.

There are also photographs, showboards and mockups about the development of the country after the Republic was proclaimed.