Hollis Leland Caswell (October 22, 1901 – November 22, 1988) was an American educator who became an authority on curriculum planning in schools. He directed surveys of curriculum practices in several school systems, and wrote several books on the subject. Caswell joined the editorial advisory board of the World Book Encyclopedia in 1936, and became its chairman in 1948. In 1954, Caswell was appointed president of Teachers College, Columbia University in New York City, and served as its president until 1962.