J. J. Williams may refer to:
John J. Williams (soldier) (1843–1865), last soldier killed in Civil War James J. Williams (1853–1926), English-born photographer in Kingdom of Hawaii J. J. Williams (Oklahoma politician) (1867–1928), American politician from Oklahoma John James Williams (poet) (1869–1954), Welsh poet, pen name J.J. Williams John J. Williams (politician) (1904–1988), American Republican senator from Delaware J. J. Williams Jr. (1905–1968), American legislator from Virginia J. J. Williams (rugby union) (1948–2020), Welsh rugby union winger JJ Williams (soccer) (born 1998), American soccer forward