Geoff Lewis (born 21 December 1935) is a Welsh retired jockey who was born in Talgarth, (Breconshire).
He moved to London with his family in 1946. He came from a large family and started his career with Ron Smyth, who was a trainer in Epsom. He will be best remembered as the jockey that won the 1,000 Guineas, 2,000 Guineas, Oaks (twice), Coronation Cup, and Prix de l'Arc de Triomphe. Most watchers of the sport of horse racing would consider that his greatest moment came in 1971 when he rode Mill Reef to win The Derby. He was regarded as one of Europe's leading jockeys between 1953 and 1979.
Geoff Lewis retired as a jockey in 1979, thereafter he applied for a trainer's license and began to train at Thirty Acre Barn, near Epsom racecourse. He trained almost 500 winners before his retirement in 1999.
He now lives in Spain.