Julius Allan Greenway Harrison (26 March 1885 – 5 April 1963) was an English composer who was particularly known for his conducting of operatic works. Born in Lower Mitton, Stourport in Worcestershire, by the age of 16 he was already an established musician. His career included a directorship of opera at the Royal Academy of Music where he was a professor of composition, a position as répétiteur at the Royal Opera House, Covent Garden, conductor for the British National Opera Company, military service as an officer in the Royal Flying Corps, and founder member and vice-president of the Elgar Society.