Lewis Williams may refer to:
- Lewis Williams (politician) (1782–1842), American politician
- Lewis Williams (boxer), English boxer
- Lewy Williams (Lewis Williams, born 2002), Welsh darts player
- Lewis Williams (rugby union) (born 1987), Welsh rugby union player
- Lewis B. Williams Jr. (1833–1863), Confederate officer during the American Civil War
See also
- Lew Williams (born 1934), American singer
- Louis Williams (disambiguation)
- David Lewis-Williams (born 1934), South African scholar