Hamma Hamma River

Hamma Hamma River
Country	United States
State	Washington
County	Mason
Source	Olympic Mountains
- coordinates	47°34′1″N 123°19′5″W / 47.56694°N 123.31806°W / 47.56694; -123.31806
Mouth	Hood Canal
- coordinates	47°32′44″N 123°2′30″W / 47.54556°N 123.04167°W / 47.54556; -123.04167Coordinates: 47°32′44″N 123°2′30″W / 47.54556°N 123.04167°W / 47.54556; -123.04167
Discharge	for near Eldon
- average	364.4 cu ft/s (10.3 m3/s)
- max	6,010 cu ft/s (170.2 m3/s)
- min	39 cu ft/s (1.1 m3/s)
Location of the mouth of the Hamma Hamma River in Washington

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.

The name Hamma Hamma comes from a Twana village once located at the river's mouth and called Hab'hab, referring to a reed that grows along the river's banks.