Glenn Foster "Slats" Hardin (July 1, 1910 – March 6, 1975) was an American athlete, winner of 400 m hurdles at the 1936 Summer Olympics.

Born in Derma, Mississippi, Glenn Hardin was the world's dominant 400 m hurdler in the 1930s and was equally tough in the 400 m flat race.

Hardin's rise began at the 1932 Summer Olympics, where he finished second in the 400 m hurdles in 52.0 but was given credit for a world record when the winner, Bob Tisdall from Ireland, knocked down a hurdle, an error that in those days disqualified a performance for world record consideration.

Hardin finished his career at the Berlin Olympics, beating John Loaring from Canada by 0.3 seconds.

Hardin was a member of the LSU Tigers outdoor track and field team that won the school's first ever NCAA Championship in 1933.