Date of Birth: 
Place of Birth: Martigues, Provence-Alpes-Côte d'Azur, France
About Gilles Coustellier
- Gilles Coustellier (born 13 May 1986 in Martigues, France) is a French mountain bike trials cyclist.
- He specialises in 26-inch trials but has also competed in 20-inch trials.Coustellier was UCI junior world champion in the 20-inch category in 2002 and then in the 26-inch category in 2003.
- In the UCI elite 26-inch category he has been world champion five times, more than any other rider.
- Competing with the French team he was team trials world champion in 2011.Gilles is the younger brother of Giacomo Coustellier, who is also a trials rider.
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