Broad Sound Islands National Park, Nature reserve in Isaac Regional, Australia.

Broad Sound Islands National Park is a national park in the Shire of Livingstone, Queensland, comprising 48 islands from Flock Pigeon Island near Clairview to High Peak Island, the furthest from any port. Four islands — Long, Tern, Quail and Wild Duck — are officially the Broad Sound Islands, while many others belong to the Northumberland Islands chain. The park forms part of the Great Barrier Reef UNESCO World Heritage site and lies 709 km northwest of Brisbane and 137 km southeast of Mackay.

The area received protected status in December 2000 when Queensland's Department of Environment and Science designated it as a national park to safeguard coastal ecosystems. The islands have long served as home to seabirds and marine turtles, making this designation a recognition of their ecological importance.

The islands form a critical habitat for numerous land and sea birds, while providing essential nesting grounds for flatback turtles.

Visitors must follow protection rules including bans on pets, open fires, and plant collection to preserve the environment. Most islands lack overnight facilities, so plan accordingly if you are considering a day trip to explore the area.

The islands feature some of the largest shallow macro-tidal bays on Australia's east coast, creating unusual tidal patterns. These distinctive water conditions support specialized habitats and species adapted to dramatic tidal shifts throughout the day.