Joseph Boyer Jr. (May 30, 1890 – September 2, 1924) was an American racing driver, and a winner of the 1924 Indianapolis 500.

He became wealthy due to his father owning Burroughs Adding Machine Company and Chicago Numatic.

Corum and Boyer were scored as "co-winners," the first time in Indianapolis 500 history such a designation had been assigned.

In three previous Indianapolis 500s (1911, 1912, 1923), a winning driver had been given relief help during the race, qualifying, starting, and finishing in the same car.

Boyer died on September 2, 1924, from injuries sustained in a crash at Altoona Speedway in Tyrone, Pennsylvania the day before.