Sunset Bay State Park, State park along the Oregon Coast in Coos County, US

Sunset Bay State Park is a 405-acre Oregon state park on the Cape Arago Highway, 2.5 miles from Charleston on Coos Bay. Its crescent-shaped sandy beach is enclosed by sandstone cliffs, and the water stays hip-deep far out, making wading unusually easy for the Oregon coast. Big Creek runs through the park's meadows.

The park was established in 1948 when Coos County donated the initial land to create this coastal preserve. Subsequent land purchases through the 1980s expanded the protected area and solidified its role as a public recreation destination.

The bay's name comes from a Coos Bay pioneer, and local lore holds that the sheltered cove once served as a pirate base. Before it became a park, fishermen used the bay as a mooring and refuge harbour. Chief's Island, off the bay, is the Native American name for the islet holding the Cape Arago Lighthouse.

The campground has over 90 tent sites and almost 30 RV sites, set by the bay and on meadows along Big Creek. A hiking trail, part of the Oregon Coast Trail, links the park to Shore Acres and Cape Arago state parks. A public golf course borders the park.

A trail network connects this park with two neighboring state parks, offering views toward Gregory Point and the Cape Arago lighthouse. This linkage creates a continuous coastal experience that ties together multiple natural areas.