William Thomas McKinley (December 9, 1938 – February 3, 2015) was an American composer and jazz pianist born in New Kensington, Pennsylvania). He wrote more than 300 musical compositions, many of which have been recorded by such ensembles as the London Symphony Orchestra, the Warsaw Philharmonic Orchestra, the Prague Radio Symphony Orchestra, the Boston Modern Orchestra Project, and the Seattle Symphony.
McKinley was the recipient of numerous honors, including an award and citation from the American Academy and Institute of Arts and Letters, a Guggenheim Fellowship, and eight National Endowment for the Arts grants. He is also among the founders of the label MMC Recordings.
His son Elliott Miles McKinley is also a composer.
He died on 3 February 2015.