Adams Island is the second largest island of New Zealand's Auckland Islands archipelago.

The southern end of Auckland Island broadens to a width of 26 km (16 mi) where a narrow channel, known as Carnley Harbour or the Adams Straits, separates it from the roughly triangular Adams Island (area approximately 100 km or 39 sq mi), which is even more mountainous, reaching a height of 705 m (2,313 ft) at Mount Dick. The channel is the remnant of the crater of an extinct volcano, with Adams Island, and the southern part of Auckland Island forming the crater rim.

Two large indentations, Bolton's Bay and Fly Harbour, are the most prominent features of the island's south coast, both in the south east.

The island is part of the Auckland Island group Important Bird Area (IBA), identified as such by BirdLife International because of the significance of the group as a breeding site for several species of seabirds as well as the endemic Auckland shag, Auckland teal, Auckland rail and Auckland snipe.

The island is notable in that no introduced mammals have ever established on Adams Island. Thus, its fauna, which may be representative of pre-human times, differs significantly from that of many other islands in the archipelago including the main Auckland Island, which still has introduced pigs, cats and mice.

• Auckland Islands
• Composite Antarctic Gazetteer
• List of Antarctic and subantarctic islands
• List of islands of New Zealand
• New Zealand subantarctic islands
• Scientific Committee on Antarctic Research