Thierry Jarnet (born 24 March 1967) is a champion thoroughbred flat racing jockey in France who won the title four times from 1992–1995. Jarnet was first apprenticed to Patrick Rago at Maisons-Laffitte and then to Yann Porzier at Chantilly, Oise.
Jarnet rode his first winner in February 1985 at Cagnes-sur-Mer on a horse called Danini. Jarnet rode 137 winners in France between 1985 and 1990. In November 1990 Jarnet signed up to ride for the trainer Andre Fabre. Jarnet's first ride for Fabre was a winning one on a horse called Subotica, that also went on to provide him with Jarnet's first Group One victory in the 1991 Grand Prix de Paris.
1991 was to also bring him victories aboard Victoire Bleu in the Prix du Cadran and Tel Quel in the Champion Stakes. With the departure of Cash Asmussen in 1991 Jarnet also took over the role as stable jockey which made him the rider for Sheikh Mohammed in France. 1992 saw Jarnet gaine his first key win by landing the Prix de l'Arc de Triomphe on Subotica, he repeated this win in 1994 on Carnegie. Jarnet won 124 races from 807 rides in 1992 to become French Champion Jockey for the first time. Jarnet won the 'Cravache d'Or' (jockeys' title) for the next three years. In 1995 he finished only three winners in front of Olivier Peslier, who at that stage was riding the many horses that Andre Fabre trained for Daniel Wildenstein. In 1996 Peslier moved ahead of Jarnet.