Sébastien Bonmalais (born 6 February 1998) is a French professional squash player. He reached a career high ranking of 21 in the world in November 2024.
Bonmalais won the 2017 Gibraltar Open and the 2017 Guatemala Open.
After a first round exit to Aly Abou Eleinen at the 2024 PSA Men's World Squash Championship in May, he won a bronze medal with France, at the December 2024 Men's World Team Squash Championships in Hong Kong.