Wynn-Williams is a surname. It may refer to:
C. E. Wynn-Williams (1903–1979), Welsh-born physicist Henry Wynn-Williams (1828–1913), 19th-century Member of Parliament and prominent lawyer in Christchurch Wynn Williams & Co, a law firm in Christchurch named after the above Sarah Wynn-Williams, New Zealand former Facebook director
See also Williams-Wynn