Alexander Raymond Kellner (August 26, 1924 – May 3, 1996) was an American starting pitcher in Major League Baseball who played for the Philadelphia / Kansas City Athletics (1948–1958), Cincinnati Reds (1958) and St. Louis Cardinals (1959).

His younger brother, Walt, also was a major league pitcher.

[1] In a 12-season career, Kellner posted a 101–112 record with 816 strikeouts and a 4.17 ERA in 1,849+1⁄3 innings pitched.

He had his best season in 1949, with 20 wins, 37 games started, 19 complete games, 245 innings pitched (all career-highs) en route to being a 1949 American League All-Star.

This biographical article relating to an American baseball pitcher born in the 1920s is a stub.