Down by the Greenwood Side is a "dramatic pastoral" composed by Harrison Birtwistle to a text by Michael Nyman. It was first performed on 8 May 1969 at the Festival Pavilion, West Pier, Brighton. The New York Philharmonic staged the opera as part of their New Horizons music festival in 1984 with conductor Larry Newland leading singers Susan Belling, Bruce Vernon Bradley, Richard Levine, John Lankston and James Billings.