Randall Flagg, the villain of a number of Stephen King books

James Montgomery Flagg, American artist

American Flagg!, a comic, with Reuben Flagg as the eponymous hero

Sam Flagg, a character in the TV series M*A*S*H

Fannie Flagg, American author

Ray Dennis Steckler, American movie director who went under the pseudonym Cash Flagg

USS Flagg, the fictional aircraft carrier in the G.I. Joe universe

Jared Bradley Flagg, American artist

Ella Flagg Young, American educator

Azariah C. Flagg, American politician

Flagg, a village in the English Peak District

Wilson Flagg, American admiral

George Whiting Flagg, American painter

Ernest Flagg, American architect

Harry Flagg, a character in the British soap opera Coronation Street

General Flagg, the name of two characters in the G.I. Joe universe