Willamette Park, Urban park next to Willamette River, Portland, United States.

Willamette Park is a 26-acre recreational area on the western bank of the Willamette River with tennis courts, soccer fields, and walking trails. The site features boat launch ramps, trailer parking, restrooms, and children's play areas.

The northern part of the park occupies the former site of the Portland Shipbuilding Company, which the City of Portland bought in 1969 to enlarge the park. In 2006 the city began clearing non-native plants from the south end as part of the South Portland Riverbanks Projects, and volunteers organized by Friends of Trees planted 250 native trees and shrubs in their place.

The Willamette Greenway Trail, part of Portland's 40-Mile Loop, runs north–south through the park, linking downtown Portland with Miles Place, Butterfly Park, Stephens Creek, the Sellwood Bridge and Powers Marine Park. A plaque at the south end marks an Oregon white oak described as one of the largest along the Greenway.

The Willamette Greenway Trail runs north–south through the park, part of Portland's 40-Mile Loop, linking downtown Portland to the north with the Sellwood Bridge and Powers Marine Park to the south. The boat dock and ramp sit on the riverbank, and a dog off-leash area is set aside within the park.

Purple martins nest in white gourds fixed to a pole near the boat ramp; the gourds are shaped so other birds avoid them, which keeps a small number of martins from losing their nests to sparrows and starlings. Gulls, sandpipers, cormorants, kingfishers and swallows also appear, and beavers frequent the area.