George Harold Kojac (March 2, 1910 – May 28, 1996) was an American competition swimmer, two-time Olympic champion, and former world record-holder in two events.

[1] Kojac and teammates Austin Clapp, Walter Laufer and Johnny Weissmuller set a new world record of 9:36.2 in the event final.

[1][2] Individually, he won another gold medal in the men's 100-meter backstroke with a second world record time of 1:08.2.

He attended DeWitt Clinton High School, and learned to swim in the East River in New York.

In 1931 he graduated from the Rutgers University and missed the 1932 Olympics because of his studies at Columbia Medical School.