William T. Lewis may refer to:
Willie Lewis (jazz musician) (1905–1971), American jazz clarinetist and bandleader William Thomas Lewis (1748–1811), English actor William Turnor Lewis (1840–1915), Wisconsin businessman and state legislator William Terrell Lewis (1757–1813), Nashville businessman William Lewis, 1st Baron Merthyr (1837–1914), Welsh coal mining magnate
See also William Lewis (disambiguation)