John H. M. Gosden, born in March 30, 1951, in Sussex, England, is a thoroughbred horse trainer.

He is the son of John "Towser" Gosden, who died in 1967. He studied economics in Cambridge University. After graduation, he went to Venezuela to work in land management. He later returned to England to become an assistant for Noel Murless. After Noel retired, John went to Ireland to become an assistant to Vincent O'Brien, and later, became the assistant to Tommy Doyle in California. He currently lives in Newmarket, England, and is married to Rachel Hood, a lawyer. He has four children: Sebastian, Serena, Thea and Thaddeus.

Attained an American Horse Training license in 1979. In 1983 he trained Bates Motel, a Handicap race horse and in 1984, he trained Royal Heroine, a turf mare. Both won the Eclipse Award, and Royal Heroine won the inaugural Breeder's Cup Mile in 1984. In 1988, he moved back to Newmarket, England, and trained horses at Stanley House Stables. In 1996, he won a British Classic when his horse, Shantou, won the St. Leger Stakes. In 1997, another of his horses, Benny the Dip, won the Epsom Derby. Near the end of 1999, he accepted Robert Sangster's offer for him to work at the Manton complex. In 2000, another of his horses, Lahan, won the 1,000 Guineas Stakes. In late 2005, he moved back to Newmarket to work at Clarehaven Stables, where he trained Nannina, who won the 2005 Fillies' Mile and the 2006 Coronation Stakes. In September 2007, John won his second St Leger, and his fourth English Classic with Lucarno.