Gervase Alan de Peyer (born 11 April 1926) is an English clarinetist and conductor.
Gervase de Peyer was born in London and attended Bedales School. He was awarded a scholarship to the Royal College of Music where he studied clarinet with Frederick Thurston and piano with Arthur Alexander. Towards the end of World War II, when he was aged 18, he joined the Royal Marines Band Service. De Peyer returned to the Royal College of Music after the war and subsequently studied in Paris with Louis Cahuzac.
In 1950 he was a founding member of the Melos Ensemble for which he continued to play until 1974. He conducted their recordings with EMI. Their recordings of chamber music for both woodwinds and strings were reissued in 2011, including the works for larger ensembles which were the reason to found the ensemble, such as Beethoven's Septet and Octet, Schubert's Octet and Ravel's Introduction and Allegro, played with Osian Ellis (harp), Richard Adeney (flute), Emanuel Hurwitz and Ivor McMahon (violin), Cecil Aronowitz (viola) and Terence Weil (cello).