St. Brigid Island (, ) is the ice-covered island 2.7 km long in southwestâÂÂnortheast direction and 1.4 km wide, largest in the Barcroft group of Biscoe Islands. Its surface area is 222 ha.
It is named after St. Brigid of Kildare (c.âÂÂ451âÂÂ525), the patron saint of scholars.
St. Brigid Island is located at , which is 1.28 km south of Watkins Island, 1.18 km west of Irving Island, 3.9 km north of Bedford Island and 3 km southeast of Belding Island, based on British mapping in 1976.