Daniel or Dan Williams may refer to:

• Daniel Williams (cricketer) (born 1981), English cricketer
• Daniel Williams (judoka) (born 1989), British judoka
• Daniel Williams (footballer, born 2001), Welsh footballer

• Dan Williams (defensive end) (born 1969), American football defensive end
• Dan Williams III (wide receiver) (born 1995), American football wide receiver
• Dan Williams (defensive tackle) (born 1987), American football defensive tackle
• Dan Williams (rugby union) (born 1989), English rugby union player

• Daniel Williams (governor-general) (1935–2024), Governor-General of Grenada
• Dan Williams (Alabama politician) (1942–2015), served in the Alabama House of Representatives
• Dan K. Williams (born 1956), serving in the Pennsylvania House of Representatives
• Dan Williams (Canadian politician), serving in the Legislative Assembly of Alberta

• Daniel Williams (born 1985), American drummer for the band The Devil Wears Prada
• Daniel Lewis Williams, American operatic basso profundo

• Daniel Williams (historian) (1932–2010), American archivist and historian
• Daniel Williams (theologian) (1643–1716), Welsh theologian
• Daniel Hale Williams (1858–1931), American surgeon
• Daniel Day Williams (1910–1973), American theologian, professor, and author
• Daniel Barclay Williams, American educator

• Danny Williams (disambiguation)