John J. Williams may refer to:
John J. Williams (baseball) (born 1916), American baseball player John J. Williams (politician) (1904–1988), American politician John J. Williams (soldier) (1843–1865), last soldier to die in the American Civil War John James Williams (poet) (1869–1954), Welsh poet John James Williams (rugby) or J. J. Williams (1948–2020), Welsh rugby player John Joseph Williams (1822–1907), American Roman Catholic bishop John Joseph Williams (actor) or Grant Williams (1931–1985), American actor
See also John Williams (disambiguation)