Marc Wilkinson (born 27 July 1929) is an Australian composer and conductor best known for his film scores, including The Blood on Satan's Claw, and incidental music for the theatre, most notably for Peter Shaffer's The Royal Hunt of the Sun. His compositional approach has combined traditional techniques with elements of the avant-garde. For most of his life resident in the UK, he has now retired from composition and currently lives in France.
Born in Paris, Wilkinson studied composition at Columbia and Princeton Universities; he also took some private lessons with Varèse in New York. He published a number of analytical articles on works by Varèse and Boulez. In England, he became one of the first independent composers to make use of the BBC Radiophonic Workshop after it opened in 1958. For a time Wilkinson was resident composer and musical director of the Royal Shakespeare Company, then musical director of the Royal National Theatre (1963–74). One of the first scores he composed in that post was for Peter Shaffer's The Royal Hunt of the Sun (1964); the result deeply impressed the playwright, who has described Wilkinson's work as "perhaps the best score for a play to be written since Grieg embellished Peer Gynt". Wilkinson subsequently wrote the incidental music to Shaffer's play Equus (1973).
Other National Theatre productions for which Wilkinson wrote incidental music included Tom Stoppard's plays Rosencrantz and Guildenstern Are Dead (1967) and Jumpers (its premiere production, 1972). He also taught at the Royal Court Theatre studio, under the directorship of Keith Johnstone, from the autumn of 1964.