Bay of Isles, Protected marine area in South Georgia and the South Sandwich Islands, South Atlantic Ocean.

The Bay of Isles is a bay 14 km wide and 5 km deep on the north coast of South Georgia, between Cape Buller and Cape Wilson. It was discovered by James Cook in 1775 and named for its at least 12 islands, many named after local birds. Its complex coastline includes Sunset Fjord, Ample Bay and Paul Beach, a 1 km shingle beach backed by 35 m cliffs.

The area was charted by Captain James Cook in 1775 during his exploration voyage through the South Atlantic. This early documentation helped establish British presence and territorial interests in the region.

The bay serves as a working research site where scientists study marine animals and their seasonal patterns. Visitors may observe researchers conducting fieldwork among the colonies of seals and birds that inhabit the area.

Visits are possible only between October and March when weather conditions are most favorable for travel. All trips operate as organized expeditions requiring special permits and experienced guides familiar with polar waters.

Of South Georgia's 31 breeding bird species, 17 are found in the Bay of Isles. Many of the bay's islands are named after local birds, such as Sheathbill Bay, named for the snowy sheathbills that live there.