Ralph Kirkman Mulford (December 28, 1884 – October 23, 1973) was an American racing driver who participated in the 1911 Indianapolis 500.

While contemporary newspaper accounts and substantiated research, including by Indianapolis Motor Speedway historian Donald Davidson, have produced no credible evidence to support a claim to the contrary,[2][4][5][6] there is an urban myth that Mulford, driving a Lozier, was the actual winner over Ray Harroun.

Mulford was retroactively declared the National Driving Champion for 1911 and 1918.

He retired from racing on tracks after 1922, but continued to compete for several more years in hill climbs, and – at one time – held the record for both the Mount Washington and Pikes Peak climbs.

At the time of his death, he was the last surviving participant of the inaugural, 1911 Indianapolis 500.