István Kossa (31 March 1904 – 9 April 1965) was a Hungarian politician, who served as Minister of Finance twice: between 1949–1950 and between 1956 and 1957.

After the secondary grammar school's accomplishment he worked in Budapest as a tram conductor.

He took a part in the trade union opposition's fights actively as member of the left-wing Tram Alliance.

Kossa was taken to the Eastern Front in 1942, where he and many other prisoners joined the Soviet troops.

He was also member of the Hungarian Socialist Workers' Party's Central Committee until his death.