Walter Phillip Rehg (August 31, 1888 – April 5, 1946) was a reserve outfielder in Major League Baseball, playing mostly as a right fielder for four different teams between the 1912 and 1919 seasons. Listed at 5 ft 8 in (1.73 m), 160 lb., Rehg batted and threw right-handed. He was born in Summerfield, Illinois. In a seven-season career, Rehg was a .250 hitter (188-for-752) with two home runs and 66 RBI in 263 games, including 85 runs, 24 doubles, 11 triples and 26 stolen bases.