István Csák, also known as Hircsák (February 18, 1915 – 1976) was a Hungarian ice hockey and field hockey player who competed in the 1936 Winter Olympics and in the 1936 Summer Olympics. In 1936 he was part of the Hungarian ice hockey team which was eliminated in the second round of the Olympic tournament. He played all six matches as goalkeeper. At the 1936 Summer Games he was a member of the Hungarian field hockey team which was eliminated in the group stage of the Olympic tournament. He played all three matches as goalkeeper.