Roy Marsden is an English actor who portrayed Adam Dalgliesh in the Anglia Television dramatisations (1983–1998) of P. D. James's detective novels, and Neil Burnside in the spy drama The Sandbaggers (1979–1980).

Adam Dalgliesh is a fictional character who is the protagonist of fourteen mystery novels by P. D. James; the first being James's 1962 novel Cover Her Face. He also appears in the two novels featuring James's other detective, Cordelia Gray.