Quatermass and the Pit is a British television science-fiction serial transmitted live by BBC Television in December 1958 and January 1959. It was the third and last of the BBC's Quatermass serials, although the chief character, Professor Bernard Quatermass, reappeared in a 1979 ITV production called Quatermass. Like its predecessors, Quatermass and the Pit was written by Nigel Kneale.

Alexander Sheriff de Moro Clunes was an English actor and theatrical manager.