Mildred Earp, nicknamed Mid or Millie (born October 7, 1925), is a former female pitcher who played from 1947 through 1950 in the All-American Girls Professional Baseball League. Listed at 5 ft 6 in (1.68 m), 135 lb, she batted and threw right-handed.

Earp was a pitcher for the Grand Rapids Chicks in a span of four years. One of the first successful underhand pitchers in the league, Earp was selected to the All-Star Team in her rookie season, recorded the second best single-season ERA and the second best career ERA in AAGPBL history, and helped Grand Rapids win their first Championship Title. She also hurled a no-hitter game and ranked between the top 10 in several pitching categories during her short stint in the league.

Following her baseball career, Earp returned to her homeland of West Fork, Arkansas. She is part of the AAGPBL permanent display at the Baseball Hall of Fame and Museum at Cooperstown, New York, opened in 1988, which is dedicated to the entire league rather than any individual player.

By 1943 a new All-American Girls Softball League was formed, playing a hybrid form of softball and baseball. The league, which started when World War II made the suspension of Major League Baseball a possibility, would eventually shift gears to become the All-American Girls Professional Baseball League, and was dissolved at the end of the 1954 season. In its 12 years of history the AAGPBL evolved through many stages. These differences varied from the beginning of the league, progressively extending the length of the base paths and pitching distance and decreasing the size of the ball until the final year of play. For the first five years the circuit used a fastpitch underhand motion, shifted to sidearm in 1947, and never really became baseball until overhand pitching began in 1948.

A native of West Fork, Arkansas, Earp started to play softball in a fourth grade league. She first heard about the AAGPBL when it came to play an exhibition game 50 miles away of her homeland. She contacted a league official and told him her desire to play in the circuit. By then the AAGPBL was preparing the transition from underhand to sidearm pitching. Earp was assigned to the Racine Belles in 1946 and tried out as a sidearm pitcher. Since she did not know anything about the baseball game, she spent the entire season sit on the dugout and was paid to learn the fundamentals of the game. Prior to the next season she was allocated to the Grand Rapids Chicks.

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