Earl Wellington Rapp (May 20, 1921 – February 13, 1992) was an American professional baseball outfielder and scout.

In Major League Baseball, he played in 1949 and from 1951 to 1952 for the Detroit Tigers, Chicago White Sox, New York Giants, St. Louis Browns and Washington Senators.

Born in Corunna, Michigan, but raised in Swedesboro, New Jersey, he batted left-handed, threw right-handed, stood 6 feet 2 inches (1.88 m) tall and weighed 185 pounds (84 kg).

He served in the United States Army and saw combat in the European Theater of Operations, attaining the rank of Sergeant and earning a Silver Star and a Purple Heart.

He was sent to the Oakland Oaks on June 11 of that season to complete an earlier trade involving Jerry Scala and Catfish Metkovich.

He was selected off waivers by the Browns on September 1 of that year, and in 98 at-bats with them he hit .327 with two home runs and 15 RBI.

In 1953, Rapp hit .311 with 24 home runs and 108 RBI for the San Diego Padres of the Pacific Coast League.

Rapp served as a scout from 1960 to 1989 for the Houston Colt .45s/Astros, Kansas City Royals, Montreal Expos and Cincinnati Reds.