Boris Luc Lambert (born 10 April 2000) is a Belgian footballer who plays for Challenger Pro League club Kortrijk on loan from the Dutch club Willem II as a centre-back and defensive midfielder.
Lambert was first featured in Eupen's senior squad in 2018, but did not make any appearances between 2018 and 2021. Lambert made his Belgian First Division A debut for Eupen on 25 July 2021 in a game against Club Brugge. He scored his first goal against Sint-Truiden on 14 August 2021.
On 29 August 2024, Lambert signed a four-year contract with Willem II in the Netherlands.
On 30 June 2025, Lambert returned to Belgium and joined Kortrijk on loan with an option to buy.