Morne Trois Pitons National Park, National park and World Heritage Site in Dominica, Caribbean.

Morne Trois Pitons National Park covers about 7,000 hectares of steep-sided volcanic hills cut by deep canyons, roughly 13 km east of Roseau. It is named for its highest summit, the 1,342 m Morne Trois Pitons, and holds five volcanic centres, more than 50 fumaroles, Titou Gorge, Emerald Pool and the Boiling Lake, a flooded fumarole about 60 m across.

Robert J. L. Guppy made the first scientific records of the area in 1868. The park was established by law in 1975, following recommendations of the Caribbean Conservation Association, as Dominica's first national park. UNESCO inscribed it in 1997 under criteria viii and x, as site #814.

The Kalinago, Dominica's indigenous people, are linked to the park through the Amerindian Heritage Trail, a route that crosses these volcanic highlands. The first scientific account of the area was written by Robert J. L. Guppy in 1868. Titou Gorge later served as a filming location for Pirates of the Caribbean.

The park lies about 13 km east of Roseau; the Laudat visitor centre supplies information and ranger services. Paths to Emerald Pool are partly paved, while routes to Boiling Lake and Middleham Falls cross steep volcanic terrain. Rain falls year-round, averaging 7,600 mm annually, so carry rain gear and start early.

Boiling Lake measures about 60 m across and sits in a flooded fumarole: water at the edge reaches 82–92 °C, while the centre churns with hotter water welling up from below. It is the world's second-largest volcanic boiling lake. The hike there starts at Laudat and crosses the Valley of Desolation, where about 50 fumaroles, mud pots and hot springs release sulphurous gases that limit vegetation to Clusia mangle, grasses and bromeliads.