Nils Ivar Agøy (born 19 November 1959) is a Norwegian historian, theologian, tolkienologist and translator. He hails from Gjøvik. He took the cand.philol. degree in history at the University of Oslo in 1987, with the master's thesis Kampen mot vernetvangen. Militærnekterspørsmålet i Norge 1885–1922. The thesis chronicled and explained conscientious objection in Norway before 1922. His academic advisor was Jorunn Bjørgum. Agøy is a co-founder of Norwegian Tolkien Society Arthedain.