Moyra Tamsin Dunwoody (born 3 September 1958), sometimes known as Tamsin Dunwoody-Kneafsey, is a British Labour politician who served as the Member of the National Assembly for Wales for Preseli Pembrokeshire from 2003 to 2007. She served in the Welsh Government from 2005 to 2007 as the Deputy Minister for Environment, Planning and Countryside and Deputy Minister for Economic Development and Transport. Dunwoody unsuccessfully stood to succeed her mother, Gwyneth Dunwoody, as the Labour candidate in the 2008 Crewe and Nantwich by-election.