Marius Amundsen (born 22 September 1992) is a Norwegian football defender who plays for Skjetten.
Amundsen started his career with Lillestrøm before joining Strømmen IF in 2012.
In July 2014 he left Strømmen and returned to Lillestrøm. His first team debut came against Aalesund in July 2014, in a match that ended in a 1-1 draw.
In the summer of 2021 he joined fifth-tier Skjetten SK.