Grégoire Jacq (born 9 November 1992) is a French tennis player.
Jacq has a career high ATP singles ranking of 346 achieved on 20 February 2017.
He also has a career high ATP doubles ranking of 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.