Károly Olt (14 May 1904 – 22 March 1985) was a Hungarian politician, who served as Minister of Finance between 1950 and 1956.

He moved from Zagreb to Hungary in 1920 (after the Treaty of Trianon).

After that Olt took part in the reestablishment of the communist party.

He was appointed Speaker of the National Assembly of Hungary in 1949.

After his financial ministership he was a member of the party's Central Leadership.