Frank Edward Dillon (October 17, 1873 – September 12, 1931), known in later years as Pop Dillon, was an American baseball player and manager. He played 22 seasons in professional baseball from 1894 to 1915, including five years in Major League Baseball, as a first baseman with the Pittsburgh Pirates (1899–1900), Detroit Tigers (1901–1902), Baltimore Orioles (1902), and Brooklyn Superbas (1904). He appeared in 312 major league games and compiled a .252 batting average. He was later a player and manager for the Los Angeles Angels of the Pacific Coast League (PCL) from 1903 to 1915. He led the Angels to PCL pennants in 1903, 1905, 1907 and 1908.

Dillon was born in 1873 in Normal, Illinois. His father, Levi Dillon, owned a business breeding and selling Percheron horses. Dillon attended the University of Wisconsin and played for the Wisconsin Badgers baseball team from 1892 to 1894. Dillon was a cousin of Hall of Famer Clark Griffith.

In 1894, Dillon figuratively worked both sides of the temperance movement by playing professional baseball for both the Peoria Distillers and the Des Moines Prohibitionists of the Western Association. Over the next four years, he played for Ottumwa in the Eastern Iowa League, Bloomington in the Western Interstate League, Dubuque, Rockford and Rock Island in the Western Association, Scranton in the Atlantic League, and Buffalo in the Western League.

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