Hank Mann (born David William Lieberman; May 28, 1887 – November 25, 1971) was a Russian-born and American comedian and silent screen star who was a member of the Keystone Cops, and appeared as a supporting player in many of Charlie Chaplin's films.

Hank Mann was born in the Russian Empire,[1][2][3] but emigrated to New York City with his parents and siblings in 1891.

One of his more sizable talkie roles was as a flustered hotel manager in the 1944 comedy-mystery Crime by Night, and he reunited with fellow Keystone player Chester Conklin as bartenders in the 1952 Bob Hope comedy Son of Paleface.

One of Mann's most famous bits was as the "glass door man" in the Three Stooges' short Men in Black.

Mann died of heart failure on November 25, 1971, at the Braewood Convalescent Hospital[4] in South Pasadena, California.