Oxwich Bay is a bay on the south of the Gower Peninsula, Wales.
Its landscape features sand dunes, salt marshes and woodland. Oxwich Bay includes a 2.5 mile-long sandy beach, accessible from the village of Oxwich. It is also a popular spot for swimming and watersports including diving, sailing, water skiing and windsurfing. There is a public footpath along the cliffs from Oxwich Bay, round Oxwich Point, and to Port Eynon Bay. Buses run every couple of hours between Oxwich and Port Eynon.
A variety of submarine cables leave the mainland of Britain from Oxwich. These include the SOLAS cable across the Irish Sea, and the TAT-11 and Gemini North transatlantic telephone cables. These latter two do not terminate here but instead continue on to France (TAT-11) and England (Gemini).
On 1 February 2007, The Travel Magazine named Oxwich beach the most beautiful in Britain.