Joseph William Kiefer (July 19, 1899 – July 5, 1975) was a pitcher in Major League Baseball who played for the Chicago White Sox and Boston Red Sox. Listed at 5 ft 11 in (1.80 m), 190 lb., Kiefer batted and threw right-handed. He was born in West Leyden, New York.
In a three-season career, Kiefer posted a 0–5 record with a 6.16 ERA in 15 appearances, including four starts, nine strikeouts, and 49+2⁄3 innings of work. He also pitched in the minors for 21 years and served in the U.S. Army during World War I.
Kiefer died in Utica, New York at age 75.