Erik Waaler (22 February 1903 – 3 March 1997) was a Norwegian professor of medicine. He was born in Hamar as a son of physician Per Waaler (1866–1923) and musician Fredrikke Amalie Holtemann Rynning (1865–1952). He was a brother of Georg and Rolf Waaler and uncle of . In November 1929 he married Esther Fasmer Dahl (1905–1994), a daughter of priest and composer Alf Fasmer Dahl and sister of .