Alcheh Island (Bulgarian: остров Алшех, romanized: ostrov Alcheh, IPA: [ˈɔstrof ɐɫˈʃɛx]) is the ice-covered island in the Barcroft group of Biscoe Islands in Antarctica 900 m long in south-southwest to north-northeast direction and 340 m wide. Its surface area is 21.72 ha.

The feature is named after the Bulgarian Argentine architect Deiana Alcheh for her support for the infrastructure development of the Bulgarian Antarctic base.

Alcheh Island is centred at 66°24′47″S 67°05′30″W / 66.41306°S 67.09167°W / -66.41306; -67.09167, which is 1.95 km southeast of Watkins Island, 305 m west of Irving Island and 500 m east of St. Brigid 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

• Bulgarian Antarctic Gazetteer. Antarctic Place-names Commission. (details in Bulgarian, basic data in English)

• Alcheh Island. Adjusted Copernix satellite image

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