Walter Elton Whittaker (June 11, 1894 – August 9, 1965), nicknamed "Doc", was an American professional baseball pitcher who played in Major League Baseball for the Philadelphia Athletics in a single game in 1916.

A native of Chelsea, Massachusetts, Whittaker played baseball at Somerville High School, where he was the winning pitcher in eight of the team's 15 victories in 1911.

One of the top pitchers in the league, he threw a no-hitter for Falmouth against Oak Bluffs in 1915.

[8] Whittaker's only major league appearance came for Baseball Hall of Fame manager Connie Mack's historically poor-performing 1916 Philadelphia club.

Whittaker tossed the final two innings for the Athletics on July 6 at Shibe Park in Philadelphia's 9-4 loss to the Detroit Tigers, whose lineup featured Hall of Famer Ty Cobb.