Marcus Lilian Thuram-Ulien is a French professional footballer who plays as a striker for Serie A club Inter Milan and the France national team.

Thuram began his professional career at Sochaux in 2015, where he played in three Ligue 2 seasons, before moving to Guingamp in 2017, spending two years in Ligue 1. He then joined Borussia Mönchengladbach spending four seasons in Germany, before he signed for Inter Milan as a free agent in 2023, winning Serie A in his first season.

Thuram was a member of France U19 which won the 2016 UEFA European Championship. In November 2020, he was called up for the first time to the senior team, ahead of games against Finland, Portugal and Sweden. He debuted on 11 November in a friendly against the Finns, a 2–0 loss at the Stade de France. He was called up for the delayed UEFA Euro 2020 in May 2021.

On 14 November 2022, Thuram received a late call-up for the 2022 FIFA World Cup, raising the squad to 26 players. In the final against Argentina, he and Randal Kolo Muani were brought on in place of Ousmane Dembélé and Olivier Giroud with France losing 2–0 in the 41st minute. He assisted Kylian Mbappé's equalizer to make it 2–2 at the end of regulation time, and was also booked for diving in the penalty area; France lost in a penalty shootout after a 3–3 draw. On 7 September, he scored his first international goal in a 2–0 win over Ireland during the Euro 2024 qualifying.

Thuram is the son of the former French international footballer Lilian Thuram, and the older brother of the professional footballer Khéphren Thuram. He was born in the Italian city of Parma while his father played for the club, and was named after Jamaican activist Marcus Garvey. Despite his father playing for Juventus and Barcelona, he as a child supported AC Milan and Real Madrid. Thuram is of Guadeloupean descent through his father.