Eyvind Alnæs (29 April 1872 – 24 December 1932) was a Norwegian composer, pianist, organist and choir director.Alnæs was born in Fredrikstad, as the son of headmaster Johannes Jørgen Lauritz Alnæs (1835–1916) and Elise Martine Hansen (1851–1931). He married Emilie Thorne (1882–1976) in 1903. He was the father of author Lise Børsum, and grandfather of novelist Finn Alnæs and artist Bente Børsum.