Grover Klemmer, Jr. (born Mar 16, 1921) is a retired American athlete. While running for the University of California, he lettered in American football, basketball and track and field. He was called the "golden boy" for the Golden Bears. In 1941, he set the world record for the 400 metres, running 46.0 around a single turn at the University of Pennsylvania Franklin Field on June 29, 1941. Two weeks earlier, he anchored the Bears mile relay team to a world record in 3:09.4, edging out the University of Southern California team anchored by Hubie Kerns (who also was second in Philadelphia) by reportedly 4 inches (10 cm). Five minutes later, he was informed of the death of his father, Grover Klemmer, Sr. earlier that day.