Robert Edgar Willett (March 7, 1884 – May 10, 1934), sometimes known by the nickname "Farmer", was a right-handed American baseball pitcher. He played professional baseball for 17 years from 1905 to 1921, including ten seasons in Major League Baseball with the Detroit Tigers of the American League from 1906 to 1913 and the St. Louis Terriers of the Federal League from 1914 to 1915. In 274 major league games, Willett compiled a 102–100 win–loss record with 142 complete games, an earned run average (ERA) of 3.08, 600 strikeouts, and 695 assists in 1,773 innings pitched.