McKinley Davis Wheat (June 9, 1893 – August 14, 1979) was an American Major League Baseball catcher from 1915 to 1921.
From 1915 to 1919, he was a teammate of his brother, Zack Wheat, on the Brooklyn Robins. The Philadelphia Phillies bought Mack in 1920. He finished out his professional career in 1922 in the Pacific Coast League.