Hywel Williams (born 14 May 1953)[1] is a Welsh Plaid Cymru politician who served as the Member of Parliament (MP) for Arfon, previously Caernarfon, from 2001 to 2024.

For the next six years, he worked for a variety of universities and colleges in Wales and abroad, as well as working for public bodies, charities, private companies and local and central government, including spending time as an adviser to the House of Commons Welsh Affairs Committee.

[6] He has been a member of numerous professional bodies in relation to social work and training, and was also spokesman for the Child Poverty Action Group in Wales.

[22][23] In November 2022, Williams announced that he would not seek re-election as an MP at the 2024 general election.

[24] His parliamentary responsibilities within Plaid Cymru are work and pensions, defence, international development and culture.