Parc naturel des Deux Ourthes, Nature park in Luxembourg Province, Belgium.

Parc naturel des Deux Ourthes is a protected nature park in Belgium's Luxembourg Province with two river branches, deep valleys, and thick forests. The site covers multiple municipalities and offers walking routes along with habitats for diverse plants and wildlife.

The park was created on 12 July 2001 by a decision of the Walloon Government, covering 76,000 hectares across six municipalities. Its name comes from the two branches of the Ourthe, the eastern and western, which both rise within its area. The eastern Ourthe forms east of the village of Ourthe near Gouvy and flows through Houffalize; the western crosses Sainte-Ode and passes between Tenneville and Bertogne. The two join north of Engreux, and the combined river meanders through La Roche-en-Ardenne before leaving the park.

The park's name comes from the two branches of the Ourthe, eastern and western, which both rise within its area and join north of Engreux. The eastern branch forms from two streams meeting east of the village of Ourthe near Gouvy. The western branch passes between Tenneville and Bertogne before the combined river winds through La Roche-en-Ardenne, the park's western gateway.

The park spans six municipalities, with La Roche-en-Ardenne as its western gateway and Houffalize on the eastern Ourthe. Around 100 km of signposted paths cross it, including the GR57, which follows the Ourthe from La Roche-en-Ardenne to Gouvy. The Escapardenne Eisleck Trail, 106 km long, enters at La Roche-en-Ardenne and runs east to Kautenbach in Luxembourg.

A hiking trail called Escapardenne-Eilseck connects multiple locations across roughly 100 kilometers through the park area and reaches the border of the Grand Duchy of Luxembourg. This long route takes walkers through changing landscapes and shows the range of terrain within the park.