Gilles-Arnaud Bailly (born 19 September 2005) is a Belgian tennis player.

[1] He had a career high ITF junior combined ranking of No.

[3][4] He made his debut at the 2022 European Open where he received a main draw wildcard but lost in the first round to compatriot David Goffin despite playing for more than three hours and winning the second set.

[5][6] He also received a wildcard for the qualifying competition at the 2023 European Open in Antwerp.

[7] He qualified for his second ATP main draw at his home tournament, the 2024 European Open but lost to Daniel Altmaier.