The Satsop River is a stream in the U.S. state of Washington. It has three main tributary Forks, the East Fork, West Fork, and Middle Fork Satsop Rivers. The main stem Satsop River is formed by the confluence of the West and East Forks. The Middle Fork is a tributary of the East Fork. The three forks are much longer than the main stem Satsop itself, which flows south from the confluence only a few miles to join the Chehalis River near Satsop, Washington.
The Satsop River's major tributaries originate in the Olympic Mountains and its southern foothills, within Grays Harbor and Mason counties. Most of the Satsop River's watershed consists of heavily wooded hill lands. The upper tributaries extend into Olympic National Forest, approaching but not quite reaching Olympic National Park. The Satsop River watershed is located east of the Wynoochee River and south of the Skokomish River watersheds.