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Marshall was born in Clapham, London. He is of Irish descent and was educated at the Salesian College, Battersea and trained as an actor at RADA, before appearing at the Bristol Old Vic and in repertory theatre and in the 1986 first national tour of The Sound of Music as Captain von Trapp.
His film credits include Rasputin the Mad Monk (1966), Alfie (1966), The Witches (1966), The Viking Queen (1967), Quatermass and the Pit (1967), Mosquito Squadron (1969), I Start Counting (1970), Man in the Wilderness (1971), Because of the Cats (1973), The Tamarind Seed (1974) and The Spy Who Loved Me (1977). By far, his most well remembered film role is the part of Councillor Harris in the crime film The Long Good Friday (1980). His later film career included roles in Australian productions such as BMX Bandits (1983), Bliss (1985), The Man from Snowy River II (1988), The Punisher (1989) with Dolph Lundgren, Country Life (1994) and Selkie (2000).
Television credits include:Spindoe, Persuasion, Warship, United!, The Forsyte Saga, Dixon of Dock Green, Z-Cars, The Saint, The Avengers, The Onedin Line, Out, The Professionals, Return of the Saint, Buccaneer, The Chinese Detective, Robin of Sherwood, Heartbeat, The Bill and Dalziel and Pascoe.
- Noble, Peter, ed. (1982). 1982–1983 Screen International Film And TV Year Book. London: King Publications.
- Bryan Marshall filmography at Fandango