Saint Gwrhai was a 5th-century saint of Wales.
He is known from a 10th-century hagiography [1] and is of disputed historicity. He was reputedly the founder of the Church at Penystrywad, Montgomeryshire, and one at Caerleon. [2] He was a colleague of Deiniol [3] and was a son of Caw of Strathclyde. [4] He is supposedly buried in the churchyard at Penystrywad. [5]