Nia Rhiannon Griffith (born 4 December 1956) is a Welsh Labour politician serving as Shadow Secretary of State for Defence in the Shadow Cabinet of Jeremy Corbyn since 2016, and has served as Member of Parliament (MP) for Llanelli since 2005.
She held the position of Shadow Secretary of State for Wales, having been appointed to the post by Labour Party Leader Jeremy Corbyn in September 2015 until she resigned in June 2016.
On 6 October 2016, Corbyn appointed Griffith as Shadow Secretary of State for Defence, replacing Clive Lewis.