Swain Reefs National Park, Marine national park in Queensland, Australia

Swain Reefs National Park lies off the Queensland coast and protects nine small coral cays with a total area of about 0.58 square kilometers. The park consists of low-lying islands and reefs surrounded by clear water that form a rich marine landscape.

Swain Reefs National Park was gazetted in 1995, covering 0.58 km2 of cays in the southern Great Barrier Reef, about 220 km off Rockhampton. It is managed by the Queensland Parks and Wildlife Service. Nine of its cays, with a combined area of 9 ha, were later identified by BirdLife International as the Swain Reefs Important Bird Area.

The park's name comes from the Swain Reefs, a group of coral reefs in the southern Great Barrier Reef. Nine cays form the Swain Reefs Important Bird Area, identified by BirdLife International because they support over 1% of the world population of breeding roseate terns. Visitors may spot masked and brown boobies, black and common noddies, and lesser frigatebirds on these cays.

The park is highly remote and accessible only through specialized boat tours run by specialist operators who arrange access. A visit requires advance planning, as regular services do not exist and sea conditions must be taken into account.

Nine cays, from Gannet Cay (1.7 ha) to Riptide Cay (0.25 ha), form the Swain Reefs Important Bird Area, identified by BirdLife International because they support over 1% of the world's breeding roseate terns. Up to 25,000 roseate terns have been recorded there, alongside masked and brown boobies and lesser frigatebirds.