Robert Winston "Bob" Day (October 31, 1944 – March 15, 2012) was an American long-distance runner who competed at the 1968 Mexico Olympics. He lettered and graduated from UCLA where he was on Jim Bush's track Team which won the 1966 NCAA Men's Outdoor Track and Field Championships. He won the 1968 US Track & Field Senior National crown in the 5,000 meter event. Later in life, he was the first head coach of both the Cross Country and Track and Field programs at Beckman High School in Irvine. He began at Beckman in 2005, and won his first Pacific Coast League title in 2008. He died of bladder cancer at his home in Irvine, California, aged 67.