Ken or Kenneth Williams may refer to:

• Ken Williams (baseball) (1890–1959), American baseball outfielder
• Kenneth Williams (New Zealand cricketer) (1882–1920), New Zealand cricketer
• Ken Williams (Australian footballer) (1918–1977), Australian footballer for Collingwood
• Ken Williams (footballer, born 1927), English professional footballer
• Kenneth Williams (swimmer) (born 1937), British Olympic swimmer
• Ken Williams (basketball), American college basketball player
• Kenneth Williams (Trinidadian cricketer) (born 1968), Trinidadian cricketer

• Kenneth Williams (politician) (1870–1935), Reform Party Member of Parliament in New Zealand
• Kenneth P. Williams (1887–1958), American mathematician
• Kenneth Williams (1926–1988), British actor
• Kenneth L. Williams (1934–2017), American herpetologist
• Ken Williams (songwriter) (1939–2022), American songwriter, music producer and singer
• Ken Williams (composer) (born 1952), Canadian composer for film and television
• Ken Williams (game developer) (born 1954), computer game developer and founder of Sierra On-Line
• Kenneth T. Williams (born 1965), Cree playwright
• Kenneth Williams (serial killer) (1979–2017), American serial killer executed in Arkansas

• Kenny Williams (disambiguation)