Bill Alsup was an American race car driver. He was the first Championship Auto Racing Teams (CART) Rookie of the Year in 1979 and competed in the 1981 Indianapolis 500, finishing 11th. He made 57 CART & USAC Champ Car starts in his career. His best race finish of third came 3 times and he was the 1981 CART Championship runner-up, putting in a winless but consistent season for Penske Racing, his only effort with a top-level team. He returned to his own team the next year and struggled until leaving Champ Car following the 1984 Sanair Super Speedway race.

The 65th Indianapolis 500 was held at the Indianapolis Motor Speedway in Speedway, Indiana, on Sunday, May 24, 1981. The race is widely considered one of the most controversial races in Indy history. Bobby Unser took the checkered flag as the winner, with Mario Andretti finishing second. After the conclusion of the race, USAC officials ruled that Unser had passed cars illegally while exiting the pit area during a caution on lap 149. Unser was subsequently issued a one-position penalty. The next morning, the official race results were posted, and Unser was dropped to second place. Andretti was elevated to first place and declared the race winner.