Leigh Adrian Harline (March 26, 1907 – December 10, 1969) was a film composer.

A graduate of the University of Utah, Harline was a musical director for local Los Angeles radio when he was hired by Walt Disney to score the Silly Symphonies cartoon series in the 1930s. Together with Frank Churchill, Larry Morey, and Paul J. Smith, Harline was responsible for such Disney-film tunes as "I'm Wishing," "Whistle While You Work," "Heigh Ho," and "Some Day My Prince Will Come."

Harline left Disney in 1941 to compose for other studios. His credits include Road to Utopia (1945), The Bachelor and the Bobby-Soxer (1947), Mr. Blandings Builds His Dream House (1948), 23 Paces to Baker Street (1956), Ten North Frederick (1958), The Remarkable Mr. Pennypacker (1959), The Wonderful World of the Brothers Grimm (1962), and 7 Faces of Dr. Lao (1964).