Frank John Leja Jr. (February 7, 1936 – May 3, 1991) was an American professional baseball player. The first baseman appeared in 26 games for the New York Yankees (1954–55) and Los Angeles Angels (1962) of Major League Baseball. He threw and batted left-handed, stood 6 feet 4 inches (1.93 m) tall and weighed 205 pounds (93 kg). Leja's single off Al Sima in Philadelphia was his only MLB hit in 23 official at bats; he scored three runs. He died from a heart attack in Boston at age 55 and was interred in Greenlawn Cemetery in suburban Nahant, Massachusetts.