Eurfyl ap Gwilym (born 14 November 1944) is a Welsh economist, deputy chairman of the Principality Building Society, and a Plaid Cymru politician.

He was born in Penparcau, Ceredigion and was educated at Ardwyn Grammar School followed by a BSc and PhD at King's College London.

[3] Plaid had dropped its opposition to sending members to the House of Lords in response to constitutional changes that give the second chamber the power to veto law-making proposals put forward by the National Assembly for Wales.

He has proposed alternatives to the current funding settlement and contributes to the Institute of Welsh Affairs on such topics, and argues that if a new formula based on need was introduced, Wales would be entitled to hundreds of millions of pounds extra a year.

[11] Ap Gwilym's public profile rose further after an interview with Jeremy Paxman on the BBC current affairs programme, Newsnight.