Dame Nia Rhiannon Griffith DBE (born 4 December 1956) is a Welsh politician who has been the Member of Parliament (MP) for Llanelli since 2005.

[4][5] She was selected to contest the Welsh seat of Llanelli for Labour at the 2005 General Election following the imposition of an all-women shortlist after the retirement of Denzil Davies.

[15] She was appointed Dame Commander of the Order of the British Empire (DBE) in the 2022 Birthday Honours for political and public service.

Following a review of expenses Sir Thomas Legg ordered Griffith to repay £4,099.77 in mortgage interest claims.

[21] In June 2010, Griffith had to repay the cost of sending 71 letters having been found to have breached Parliamentary rules on using House of Commons stationery for political purposes.

[25] Griffith owns a house in Llanelli, a flat in London,[26] and a smallholding in Carmarthenshire which received Tir Gofal funding.