Matthieu Cornette (born 4 September 1985) is a French chess player. He was awarded the title of Grandmaster by FIDE in 2008. He won the French Chess Championship in 2016.

Cornette was born in Bègles on 4 September 1985.^[1] He learned to play chess at school at the age of 11. He made quick progress and won the French U18 and U20 Championships. At age 18, he decided to become a professional chess player.^[2] Beginning in 2008, he received coaching from Josif Dorfman.^[1] Cornette earned his grandmaster title in 2008.^[1] In 2009, he represented France at the 17th European Team Chess Championship. Playing on the fourth board, he scored 2/6 (+1–3=2).^[3] He won the French Chess Championship in 2016, held in Agen.^[4] In 2019, he won the 27th Saint-Affrique Open, with a score of 8/9.^[5] He had previously placed second in the tournament in 2016, and tied for first in 2018.^[2] Cornette also works as a chess coach.^[2]

Cornette married Lithuanian chess player Deimantė Cornette (née Daulytė) in September 2016.^[6][7]