Stanley or Stan Williams may refer to:

• Stan Williams (American football) (1929–2015), American football player
• Stan Williams (Australian footballer) (1891–1966), Australian rules footballer
• Stan Williams (baseball) (1936–2021), American baseball player
• Stan Williams (soccer, born 1919) (1919–2007), South African association football player
• Stanley Williams (rugby union, born 1886) (1886–1936), Wales-born England international rugby union player
• Stanley Williams (rugby union, born 1914) (1914–?), Wales international rugby union player
• Stan Williams (speedway rider) (1917–2002), English speedway rider

• Stanley Thomas Williams (1888–1956), American literary critic and scholar of Herman Melville.
• Stanley Williams (1953–2005), founder of American gang The Crips
• Stanley Williams (dancer) (1925–1997), 20th century dancer and instructor
• R. Stanley Williams (born 1951), HP Labs scientist