Humphrey John Stewart (22 May 1856 – 1932) was an American composer and organist, born in England. A native of London, he came to the United States in 1886, and served for many years as a church organist on the West Coast. In 1898, he was awarded a doctorate degree in music from the University of the Pacific. In 1901, he gave a recital in Buffalo, New York and accepted a position at Trinity Church in Boston, but after two years he returned to San Francisco. In 1915, Stewart took a position as organist at the Panama-California Exposition in San Diego, and stayed in that city for many years, playing open-air organ concerts at Balboa Park.