Frank Jerry Kostro (born August 4, 1937) is a retired American professional baseball player.

Following his big league career, Kostro played in Japan in 1970 for the Hankyu Braves.

Kostro threw and batted right-handed and was listed as 6 feet 2 inches (1.88 m) tall and 190 pounds (86 kg).

He signed with the Tigers in 1956 after attending the University of Michigan and his pro career in North America lasted for 14 seasons.

His 114 MLB hits included 17 doubles, two triples, and five home runs.