Carl Johan Sverdrup Marstrander (26 November 1883 – 23 December 1965) was a Norwegian linguist, known for his work on the Irish language.
[3][6] His articles were of enduring influence, and published in Revue Celtique and Zeitschrift für Celtische Philologie, and his own journal, Norsk Tidsskrift for Sprogvidenskap which he founded in 1928.
[3] His Bidrag til det Norske Sprogs historie i Irland (1915) and Les présents indo-européens à nasale infixée en celtique (1924), are two of his larger works.
[3] He is also known for his writings on the history of the Isle of Man,[7] and for securing support and recognition for the Manx historian John Kneen.
[8] He made pioneering sound recordings of the Manx language, at a time when few fluent native speakers survived.