Hamma Hamma River
General data
- Name: Hamma Hamma River
- Water system: Salish Sea
- Water type: River
- Progression: Hood Canal -> Puget Sound -> Salish Sea -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
The Hamma Hamma River is a river on the Olympic Peninsula in the U.S. state of Washington. It rises near Mount Washington in the Olympic Mountains within the Olympic National Park and drains to Hood Canal and thence to the Pacific Ocean.