Marius Mouandilmadji (born 22 January 1998), commonly known as Marius, is a Chadian professional football player who currently plays as a forward for Portuguese club Porto.
On 17 July 2018, Marius signed a four-year contract with FC Porto. Despite initial media reports stating that the youngster would play for the reserve side, manager Sérgio Conceição integrated him with the pre-season main squad.
Marius made his professional debut for the Primeira Liga title holders on 11 August as an 81st-minute substitute for fellow Coton Sport FC de Garoua graduate Vincent Aboubakar, and scored the final goal of a 5–0 home win over G.D. Chaves. He then dropped down to the second team in LigaPro, and scored both of their goals of a 2–1 win over C.D. Cova da Piedade on 11 November.