Mats Nilsson (born December 5, 1983) is a Swedish grappler and retired mixed martial artist.
Nilsson formerly competed in the Welterweight division of the Ultimate Fighting Championship.
He is the three time FILA Grappling world champion in the -90 kg no-gi and -92 kg no-gi division and a two-time bronze medalist in FILA Grappling European Championship.
Nilsson holds a black belt in both Judo and Brazilian jiu-jitsu.
He is currently fighting out of Rumble Sports, Copenhagen, Denmark, while representing Kaisho Martial Arts, Helsingborg, Sweden in Grappling.