William Merrill may refer to: William Emery Merrill (1837–1891), American soldier and military engineer William Henry Merrill (1868–1923), American electrical engineer and founder of Underwriters Laboratories William P. Merrill (1867–1954), American theologian and hymn-writer William Stetson Merrill (1886–1969), American librarian See also William Merrill Whitman (1911–1993), American lawyer and officer of the Panama Canal Company