Ynystawe (also Ynysdawe in Welsh; Welsh pronunciation: [ɨ̞nɨ̞s.taʊ.ɛ]) is a small village in the City and County of Swansea in Wales, in the electoral ward of Morriston. It is centred half a mile (1 km) north of Junction 45 of the M4 motorway, between Ynysforgan and Clydach in the lower Swansea Valley.