The Quinault River ( or ) is a long river located on the Olympic Peninsula in the U.S. state of Washington. It originates deep in the Olympic Mountains in the Olympic National Park. It flows southwest through the Enchanted Valley to opposite Quinault Canyon. Several miles above Lake Quinault the river is joined by its main tributary, the North Fork Quinault River. The main stem Quinault River above this confluence is sometimes called the East Fork Quinault River. Below the confluence the river marks the boundary of Olympic National Park for several miles before emptying into Lake Quinault. After the lake, the Quinault River flows southwest, reaching the Pacific at Taholah. From Lake Quinault to the ocean, the river is contained within the Quinault Indian Reservation.