Magnus Bernhard Olsen (28 November 1878 – 16 January 1963) was a Norwegian philologist who specialized in Old Norse studies. Born and raised in Arendal, Olsen received his degrees in philology at Royal Frederick University in Kristiania, where he became a protége of Sophus Bugge. After Bugge's death, Olsen succeeded him in 1908 as Professor of Old Norwegian and Icelandic Literature at Royal Frederick University. In this capacity, Olsen taught generations of Norwegian academics and teachers. His field of research centered on runology and Old Norse toponymy. Olsen was particularly interested in using evidence from runes and toponomy for the study of Old Norse religion. Olsen published a number of works on these subjects, which have been highly influential. He also edited a number of works, i