Oliver Knussen CBE (born 12 June 1952) is a British composer and conductor.
Oliver Knussen was born in Glasgow, Scotland. His father, Stuart Knussen, was principal double bass of the London Symphony Orchestra, and also participated in a number of premieres of Benjamin Britten's music. Oliver Knussen studied composition with John Lambert between 1963 and 1969, and also received encouragement from Britten. He spent several summers studying with Gunther Schuller at Tanglewood in Massachusetts and in Boston. He later became the head of contemporary music activities at Tanglewood, between 1986 and 1993.
He was married to Sue Knussen, a US-born producer and director of music programmes for BBC television and for the UK's Channel 4 – for which she made Leaving Home, an introduction to 20th-century music presented by Simon Rattle in a series of seven one-hour programmes, which won the 1996 BAFTA award for "Best Arts Series". She ran the Los Angeles Philharmonic's education department in the late 1990s. Oliver and Sue Knussen had a daughter, Sonya, who is a mezzo-soprano.