Charles Greene Bittick Jr. (November 2, 1939 – April 28, 2005) was an American water polo player and swimmer. He was a member of the American water polo team that finished seventh at the 1960 Olympics. He played five matches and scored three goals. He won three silver medals, two in the 100 m backstroke and one in water polo, at the Pan American Games in 1959–63. In 1960, Bittick briefly held the world record in the 200 m backstroke, and in 1961 he won the 400 yd medley event at the AAU championships, setting a new national record. After retiring from competitions he settled in Yorba Linda, California, where he worked as a broker for Farmer's Insurance. He remained active in recreational sports, and in 1997 climbed Mount Rainier; he also crossed the Sea of Cortés in a kayak, together with his brother.
In 1979, he was inducted into the USA Water Polo Hall of Fame.