Robert Longden (born 1951) is a British composer, librettist, director and film, stage and television actor whose career has spanned four decades. In 1975 he took over the role of Riff Raff from Richard O'Brien in the original production of The Rocky Horror Show; later with Hereward Kaye he wrote the West End musical Moby Dick.
Longden attended The King's School in his native Macclesfield before receiving a scholarship to train at the Royal Central School of Speech and Drama (1969 to 1974) where he was awarded the Diploma of Speech and Drama and the John Gielgud Award for comedy.
Longden's theatre career started with the Royal Shakespeare Company before taking over the role of Riff Raff from Richard O'Brien in the original production of The Rocky Horror Show in 1975 aged 24.
Theatre roles include Rosencrantz and Guildenstern Are Dead for the Young Vic; In the Boom Boom Room for American Repertory Theater; Cholly in Major Barbara for the Chichester Festival Theatre; he created the role of 'Mum' in the original production of Berkoff's East (1975) for the London Theatre Group with Berkoff in the cast; Earl Williams in Windy City (1982); Me and My Girl with Robert Lindsay (1984); Hilary Maddox-Brown in Outside Broadcast by Peter Woodward with David Tomlinson for the Birmingham Repertory Theatre and Cardinal in the musical Casanova (2008) at the Greenwich Playhouse.