Walter Frederick Moser (February 27, 1881 – December 10, 1946) was an American pitcher in Major League Baseball who played for the Philadelphia Phillies during the 1906 season and with the Boston Red Sox and St. Louis Browns in 1911. Listed at 5 ft 9 in (1.75 m), 170 lb., Moser batted and threw right-handed. He was born in Concord, North Carolina, United States.
In a two-season career, Moser posted a 0–7 record with 4.58 earned run average in 14 appearances, including nine starts, 30 strikeouts, 30 walk, 97 hits allowed, and 70+2⁄3 innings of work.
Moser died at the age of 65 in Philadelphia.