Steep Holm () () is an English island lying in the Bristol Channel. The island covers at high tide, expanding to at mean low water. At its highest point it is above mean sea level. It lies within the historic boundaries of Somerset and administratively, it forms part of North Somerset. Between 1 April 1974 and 1 April 1996 it was administered as part of Avon. According to legend in the 6th century Saint Gildas lived on Steep Holm visiting his friend Saint Cadoc, who lived on Flat Holm as a hermit. Gildas supposedly left the island to become Abbot of Glastonbury.