DeWitt Clinton Cregier (born: June 1, 1829; died: November 9, 1898; buried in Rosehill Cemetery) served as mayor of Chicago, Illinois (1889–1891) for the Democratic Party. Prior to this he was an engineer with the City of Chicago, and was awarded, in 1875, U.S. Patent 164,149 and in 1876, U.S. Patent 173,768, both for fire hydrants.