Alexander Nathaniel Gaston (March 12, 1893 – February 8, 1979) was an American catcher in Major League Baseball who played between 1920 and 1929 for the New York Giants (1920–1923) and Boston Red Sox (1926, 1929).

His younger brother, Milt Gaston, was a major league pitcher.

Although the New York Giants won the World Series in 1921 and 1922, Gaston did not see postseason action in either year.

Gaston died in Marina del Rey, California at age 85.

This biographical article relating to an American baseball catcher born in the 1890s is a stub.