William Torrey Harris (September 10, 1835 – November 5, 1909) was an American educator, philosopher, and lexicographer. He worked for nearly a quarter century in St. Louis, Missouri, where he taught school and served as Superintendent of Schools for twelve years. With Susan Blow, in 1873 he established the first permanent, public kindergarten in the country. He is also known for establishing high school as an integral part of public education.