Ysaline Bonaventure (French pronunciation: [izalin bɔnavɑ̃tyʁ]; born 29 August 1994) is a Belgian professional tennis player.

She was selected for the Fed Cup team for the first time in 2012 when she played a doubles match alongside Alison Van Uytvanck in the World Group play-offs.

She lost again in the third and final round of qualifying at Roland Garros in 2018, before making her major main-draw debut in 2019, at the Australian Open and then at Wimbledon.

She also reached as a qualifier the quarterfinals in Rabat where she lost to compatriot Alison Van Uytvanck, and the third round in Indian Wells where she defeated wildcard Taylor Townsend and 28th seed Donna Vekić, before losing to Karolína Plíšková.

Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.