Alfred "Al" Unser (born May 29, 1939) is a former American automobile racing driver, the younger brother of fellow racing drivers Jerry and Bobby Unser, and father of Al Unser, Jr.. He is the second of three men to have won the Indianapolis 500-Mile Race four times, the fourth of five to have won the race in consecutive years, and is the only person to have both a sibling (Bobby) and child (Al Jr.) as fellow winners. Al's nephews Johnny and Robby Unser have also competed in the 500.
After his son Al Jr. joined the top circuit in 1983, Unser has generally been known by the retronymic name of "Al Unser, Sr."
Unser was born in Albuquerque, New Mexico. His father Jerry Unser and two uncles, Louis and Joe, were also drivers. Beginning in 1926 they competed in the Pikes Peak International Hill Climb, an annual road race held in Colorado.