Isidor, IPA: [ˈɔstrof svɛˈti isiˈdɔr]) is the ice-covered island 1.65 km long in southwest–northeast direction and 890 m wide in the Barcroft group of Biscoe Islands.

[1] Upon viewing map coordinates in August 2024, researchers found that the island appears to be underwater, perhaps even melting.

The feature is named after St. Isidore of Seville (c. 560–636), the unofficial patron saint of internet and computer users, programmers and technicians.

This article includes information from the Antarctic Place-names Commission of Bulgaria which is used with permission.

This Biscoe Islands location article is a stub.