Marius Sandvei (15 January 1905 – 1 November 1993) was a Norwegian linguist, educator and language politician. He is particularly known for his long-term editing of the Norwegian normative dictionary Tanums store rettskrivningsordbok. Sandvei was a member of Kristiansund city council, and was a parliamentary ballot candidate from the Oslo constituency in 1957 and 1961. In Kristiansund he also chaired the local branches of Rotary and Foreningen Norden. He was a central board member of the .