Clarence William Dupnik (born January 11, 1936) is a retired American law enforcement official.
Dupnik was appointed Sheriff of Pima County, Arizona, in February 1980 to fill a vacancy rising from the resignation of his predecessor, Richard Boykin.
He won election in his own right in September 1980, and has been re-elected every four years since.
Dupnik is a member of the Democratic party.
Dupnik retired from the Pima County Sheriff's Office in 2015.