Ynys Bery is a small island south of Ramsey Island, Pembrokeshire, Wales, in the community of St David's and the Cathedral Close.

Fenton, in 1811, describes the island, and its neighbour Ynys y Cantwr: ...with high craggy cliffs, producing a thick matted herbage mixed with scurvy-grass and the sea pink, affording pasture for a few sheep, and stocked with rabbits, puffins, elygogs,[note 1] gulls and other sea fowl.

[2]In 1903, the S.S. Graffoe (a 2,996-ton steamship bound from Glasgow to Montevideo with 3,800 tons of coal) struck Ramsey Island and sank at the northern end of Ynys Bery.

Together with neighbouring Ynys Cantwr, Ynys Bery is a breeding ground for lesser black-backed gulls.

In the spring the island is covered with pale blue squill.