Douglas Lawrence McWeeny (August 17, 1896 – January 1, 1953) was a pitcher in Major League Baseball. He pitched from 1921–1930. He pitched right-handed.
McWeeny made his big-league debut on April 24, 1921, and won three games for the Chicago White Sox that season. His best year came in 1928 with the Brooklyn Robins, with a 14-14 record that included a National League-best four shutouts. He also led the NL in walks that season (114), and had a league-worst 11 wild pitches in 1929, a year before his career came to an end.
Nicknamed Buzz, McWeeny worked as a service station attendant in the off-season.