Daniel Williams (c. 1643 – 26 January 1716) was a British benefactor, minister and theologian, within the Presbyterian tradition, i.e. a Christian outside the Church of England.

He is known largely for the legacy he left which led to the creation of Dr Williams's Library, a centre for research on English Dissenters.

He became a preacher by the age of nineteen: details of his education are unknown, though it was probably cut short by his refusing to conform to the state church, Anglicanism, when Charles II was restored to the throne.

[1] He refused to be convinced to return to Ireland by the Dublin congregation, and spent the rest of his career in London, where he advised William III on Irish matters.

The library is known to researchers of history and genealogy for its holdings of pre-19th century material relating to Protestant nonconformity in England.