Quatermass is a 1979 British television science fiction serial. Produced by Euston Films for Thames Television, it was broadcast on the ITV network in October and November 1979. Like its three predecessors, Quatermass was written by Nigel Kneale. It is the fourth and, to date, final television serial to feature the character of Professor Bernard Quatermass, this time played by John Mills.

Thames Television, commonly simplified to just Thames, was a franchise holder for a region of the British ITV television network serving London and surrounding areas from 30 July 1968 until the night of 31 December 1992. Thames Television broadcast from 09:25 Monday morning to 17:15 Friday afternoon at which time it would hand over to London Weekend Television (LWT).