Sir Ralph Lilley Turner MC (5 October 1888 – 22 April 1983) was an English Indian languages philologist and university administrator. He is notable for composing an Indo-Aryan comparative dictionary. He is also the author of some publications concerning the Romani language.
Turner was born in Charlton, London, the son of Bertha (Lilley) and George S. Turner. He was educated at the Perse School and Christ's College, Cambridge.
In 1913, he joined the Indian Educational Service as a lecturer at Queen's College, Benares. From 1915 to 1919, he served with the 2nd/3rd Queen Alexandra's Own Gurkha Rifles, winning the Military Cross in Palestine. From 1920 to 1922, he was Professor of Indian Linguistics at Benares Hindu University.
In 1922, Turner returned to England as Professor of Sanskrit at the School of Oriental Studies at the University of London. Between 1924 and 1932, he also published several papers on Romani Studies in the Journal of the Gypsy Lore Society, including "On the position of Romani in Indo-Aryan" (1927). He was director of the school from 1937 to 1957, although he continued to occupy his chair as well until 1954. He was knighted in 1950. His magnum opus, the Comparative Dictionary of the Indo-Aryan languages was published in 1966.