Marius Sandvei (15 January 1905 – 1 November 1993) was a Norwegian linguist, educator and language politician.

He finished his secondary education in Trondheim in 1924, and graduated from the Royal Frederick University in 1930, his main subject being the Norwegian language.

[2] Sandvei took an active role in the debates surrounding the formation and maintenance of the Norwegian language.

He is particularly well known for his role as editor of the normative dictionary Norsk rettskrivningsordbok, which had been initiated by philologist Jakob Sverdrup.

[1] Sandvei was a member of Kristiansund city council,[1] and was a parliamentary ballot candidate from the Oslo constituency in 1957 and 1961.