Tamsin Dunwoody-Kneafsey (b. ca 1960) was elected to the Welsh Assembly in the election of 1 May 2003 to represent the Preseli Pembrokeshire constituency for the Labour Party.

As of 2005, she is Deputy Minister for Economic Development and Transport in the Welsh Assembly Government.

She is the daughter of the veteran Labour Member of Parliament, Gwyneth Dunwoody, and John Dunwoody , also a Labour MP, and grand-daughter of former Labour Party General Secretary, Morgan Philips .