Frederick Tenney (November 26, 1871 – July 3, 1952) was an American professional baseball player whose career spanned 20 seasons, 17 of which were spent with the Major League Baseball (MLB) Boston Beaneaters/Doves/Rustlers (1894–1907, 1911) and the New York Giants (1908–1909). Described as "one of the best defensive first basemen of all time", Tenney is credited with originating the 3-6-3 double play and originating the style of playing off the first base foul line and deep, as modern first basemen do. Over his career, Tenney compiled a batting average of .294, 1,278 runs scored, 2,231 hits, 22 home runs, and 688 runs batted in (RBI) in 1,994 games played.