Torleiv Hannaas (Norwegian pronunciation: [ˈtʊ̀lːæɪv ˈhɑnːoːs];^[tone?] 14 July 1874 – 19 November 1929) was a Norwegian philologist.

He was born in Hornnes as a son of farmers Thomas Nilsson Hannaas (1843–1915) and Anne Tolleivsdotter Vetrhus (1845–1944). In July 1906 he married teacher Ingerd Yttreland (1879–1954).^[1] Their daughter Liv married banker Egil Hiis Hauge.^[2] Torleiv Hannaas died in November 1929 in Fana.^[1]

He became professor at Bergen Museum in 1918. His most important publications was Norske bygder I (1921) and Norske bygder II (1926), about the dialects in Setesdal and Vest-Agder. He founded the Norsk Aarbok in 1920, and is often credited for introducing the term Høgnorsk in an article in 1922.^{[citation needed]} He was the chairman of Noregs Mållag from 1926 to his death.^[3][1]