Léo Joseph Paul Westermann (born 24 July 1992) is a French professional basketball player for Fuenlabrada of the Spanish Liga ACB.

In November's EuroLeague away game against CSKA Moscow, he tore his ACL on his knee, which sidelined him for the remainder of the season.

[12] On 30 May 2016, Westermann signed a one-year contract, with the possibility to extend it for one more year, with the Lithuanian club Žalgiris.

[17] On 22 December 2020, Westermann signed as a free-agent with EuroLeague powerhouse FC Barcelona of the Liga ACB.

[17] On 29 July 2021, Westermann signed a one-year deal with EuroCup champions AS Monaco Basket of the French LNB Pro A and the EuroLeague.

[20] As a player of France's junior teams, Westermann won a silver medal at the 2009 FIBA Europe Under-18 Championship.

However, unlike his teammate in Partizan Belgrade, Joffrey Lauvergne, he did not make it onto France's final 12-man squad for the tournament.