Marquam Nature Park, Urban park in Portland, United States.

Marquam Nature Park is a 203.5-acre park in a gulch northeast of Marquam Hill in southwest Portland, Oregon. It lies in the Tualatin Mountains, also called the West Hills, and has several miles of hiking trails. Native plants include bigleaf maple, Douglas fir, red cedar, and western hemlock. The entrance features a shelter with interpretive displays and maps.

Portland Parks & Recreation acquired the 203.5-acre park in 1979. Neighbours had already stopped housing development on Marquam Ravine, and in 1968 they formed the volunteer group Friends of Marquam Nature Park. The park lies in the West Hills gulch northeast of Marquam Hill.

In 2013 the Friends of Marquam Nature Park and the Regional Arts & Culture Council funded a mosaic for one of the entrance shelter's walls. Assembly began in August, and the work was dedicated on September 28, 2013; the project cost $17,600.

The trails are open year-round and connect to larger loop systems throughout the city, allowing visitors to extend their hikes. Sturdy footwear is recommended due to steep terrain and muddy conditions, especially after rain.

The Friends of Marquam Nature Park formed in 1968 after neighbours stopped a housing development on Marquam Ravine. In 2013 the group and the Regional Arts & Culture Council funded a mosaic on a shelter wall at the entrance, assembled in August and dedicated on September 28; it cost $17,600.