Thorleif Brandtmann Dahl (17 March 1891 – 5 September 1967) was a Norwegian philologist and businessperson.
He was born in Kristiania.
He was chief editor of the series Aschehougs verdenshistorie, published from 1953 to 1958, and of the series VÃ¥rt folks historie, published from 1961 to 1964.
After the death of his brother he had taken over a profitable advertising agency established by his brother.
Dahl is remembered for his generous donations to cultural purposes, in particular the funding of "Thorleif Dahls kulturbibliotek", a series of classical books translated into Norwegian language.
His name is coupled to the Norwegian Academy Prize in memory of Thorleif Dahl.