Marius Mason (born Marie Mason, January 26, 1962) is an American anarchist who in 2009 was sentenced to 22 years in prison after admitting 13 counts of arson and property damage amounting to US$4 million. Mason, a member of the Earth Liberation Front, was prosecuted for a 1999 attack on a building at Michigan State University, East Lansing, Michigan, that caused more than US$1 million in damage, undertaken as a protest against research into genetically modified crops. A further US$3 million in damage included attacks on homes under construction, and on boats owned by a mink farmer.