Dafydd Wynne Wigley, Baron Wigley, PC (born David Wigley; 1 April 1943) is a Welsh politician. He served as Plaid Cymru Member of Parliament (MP) for Caernarfon from 1974 until 2001 and as Assembly Member for Caernarfon from 1999 until 2003. He was the leader of Plaid Cymru from 1981 to 1984 and again from 1991 to 2000. On 19 November 2010 it was announced that he had been granted a life peerage by the Queen, and he took his seat in the House of Lords, as Baron Wigley of Caernarfon, on 24 January 2011.