Alf Fasmer Dahl (20 May 1874 – 21 June 1933) was a Norwegian priest and composer.
He was born in Trondhjem as a son of vicar and composer Jonas Dahl (1849–1919) and Julie Marie Fasmer (1847–1925). In 1900 he married banker's daughter Aagot Ellingsen (1873–1958).[1] Their daughter Pauline Mathilde "Titt" Fasmer Dahl became a children's writer.[2] Another daughter Esther married professor of medicine Erik Waaler.[3]