St. Christopher Island (Bulgarian: остров Св. Христофор, romanized: ostrov Sv. Hristofor, IPA: [ˈɔstrof svɛˈti xristoˈfɔr]) is the mostly ice-covered island extending 680 m in southwest–northeast direction and 580 m in southeast–northwest direction lying in Papazov Passage, Biscoe Islands. Its surface area is 24 ha.

The feature is named after Saint Christopher (3rd century), the patron saint of travellers.

St. Christopher Island is located at 66°14′58″S 67°07′16″W / 66.24944°S 67.12111°W / -66.24944; -67.12111, which is 3 km southwest of Edholm Point on Krogh Island, 90 m west-northwest of Bona Mansio Island, 1 km northeast of the nearest point of DuBois Island and 1.86 km southeast of Talbott Point on the last island. British mapping in 1976.

• British Antarctic Territory. Scale 1:200000 topographic map. DOS 610 Series, Sheet W 66 66. Directorate of Overseas Surveys, UK, 1976
• Antarctic Digital Database (ADD). Scale 1:250000 topographic map of Antarctica. Scientific Committee on Antarctic Research (SCAR). Since 1993, regularly upgraded and updated

• List of Antarctic and subantarctic islands

• St. Christopher Island. SCAR Composite Gazetteer of Antarctica
• Bulgarian Antarctic Gazetteer. Antarctic Place-names Commission. (details in Bulgarian, basic data in English)

• St. Christopher Island. Adjusted Copernix satellite image

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