Janet Guthrie (born March 7, 1938) is a retired professional race car driver and the first woman to qualify and compete in both the Indianapolis 500 and the Daytona 500, both in 1977. She had first attempted to enter the Indianapolis 500 in 1976 but failed to qualify. She raced in three Indy 500s: 1977-79. She was also the first woman to lead a lap in the NASCAR Winston Cup Series. Guthrie was originally an aerospace engineer, and after graduating from the University of Michigan with a physics degree in 1960, she worked with Republic Aviation.