Grégoire Jacq (born 9 November 1992) is a French tennis player. Jacq has a career high ATP singles ranking of World No. 332 achieved on 29 October 2018. He also has a career high ATP doubles ranking of World No. 210 achieved on 14 August 2017. Jacq made his ATP main draw debut at the 2017 French Open after receiving a wildcard to the doubles main draw with Hugo Nys. They were defeated by Jan-Lennard Struff and Mischa Zverev in the first round.