Born in London, he was educated at Haileybury. In 1933 he began work as a trainee in his family's laundry business. In 1937–38 he studied at Westminster School of Art, and 1938–40 at the Slade School of Fine Art in London and Oxford. In the Second World War he was a conscientious objector, first working on land drainage in Oxfordshire, then looking after monkeys being studied by the zoologist Solly Zuckerman.
He settled in Zennor, Cornwall, in 1945, and in 1946 was co-founder of the Crypt Group. He married Suzanne Lethbridge, daughter of the writer Mabel Lethbridge whom he met in Cornwall. He taught at Bath Academy of Art, Corsham, from 1951 to 1956. He was a member of the London Group of artists, and of the Penwith Society of Arts. He died at Penzance, Cornwall. His auction record is £131,000 for his painting In the Streams Path (1958), set at Sotheby's on 11 November 2016. The work had been acquired by the pop star David Bowie in 1995 at the sale of the collection of Sir John Moores.
Some of his most remarkable works are constructions which he titled IMOOS (Images Moving Out Onto Space). Using a parabolic mirror, he would hang contrasting pairs of painted shapes, which rotated freely. Their reversed reflections enlarged, appearing to move in opposite directions.
His works are also in the collections of the Arts Council, the National Galleries of Scotland, the National Museum & Gallery of Wales, Kelvingrove Art Gallery & Museum, Glasgow, Southampton City Art Gallery, York City Art Gallery, the Ferens Art Gallery, Hull, the Government Art Collection, the Towner Gallery, Eastbourne, Bristol City Museum and Art Gallery, the Usher Gallery, Rugby Art Gallery and Museum, Birmingham Museum & Art Gallery, Abbot Hall Art Gallery, Kendal, the Whitworth Art Gallery and Leeds City Art Gallery.
- The-Artist.orgwebsite (Includes chronology and photographic portrait) Archived 14 June 2006 at the Wayback Machine
- Post-War British Art sale
- Tate St Ives: Bryan Wynter Retrospective
- Bryan Wynter's works in the Tate collections
- Bryan Wynter's works in the British Council collection Archived 5 April 2012 at the Wayback Machine
- Bird, Michael, 'A Stream Finds its Way: Painting and Process', Bryan Wynter: Centenary Exhibition (exhib. cat., Jonathan Clark Fine Art, London, 2015)
- Bird, Michael, Bryan Wynter. Lund Humphries (2010) ISBN 978-1848220096
- Bryan Wynter 1915-1975: catalogue of an exhibition 16 October – 15 November 2002, introduction by Mel Gooding. Jonathan Clark Fine Art, London, 2002. - Gooding gives a deep analysis of the influences on Wynter, including his friendship with Patrick Heron. However, there is little biographical material in the three A4 pages. Bibliographical notes. 16 works illustrated in colour.
- Bryan Wynter (St.Ives Artists series) by Chris Stephens. Tate Gallery Publishing (1999) ISBN 1-85437-293-9