Walter Elton Whittaker (June 11, 1894 – August 9, 1965) nicknamed "Doc", was an American professional baseball pitcher who played for one season.
Whittaker was born in Chelsea, Massachusetts, and graduated from Tufts University before pitching two innings in his only Major League Baseball appearance.
He pitched for the Philadelphia Athletics in one game on July 6, 1916.
In 1914 and 1915, he played summer baseball for the Falmouth Cottage Club in what is now the Cape Cod Baseball League.
One of the top pitchers in the league, he threw a no-hitter against Oak Bluffs in 1915.