Dorian Leon Marlois Le Gallienne (19 April 1915 – 27 July 1963) was an Australian composer, teacher and music critic.
Dorian Le Gallienne was born in Melbourne in 1915. His father, an actor, was born in France, and his mother, a pianist who had studied with G. W. L. Marshall-Hall, was the daughter of the Assistant Astronomer at the Melbourne Observatory. His parents separated in 1924, and his father lived in England thereafter. He attended Melbourne Church of England Grammar School. He was diagnosed with diabetes at age 16. After leaving school, he studied with A. E. H. Nickson at the Melbourne Conservatorium and with Arthur Benjamin and Herbert Howells at the Royal College of Music in London in 1938. In 1939, he travelled in Europe with Richard Downing, a future Chairman of the Australian Broadcasting Commission (ABC), and with whom he later lived in Melbourne in a mud-brick house at Eltham.