Turnagain Arm
General data
- Name: Turnagain Arm
- Water system: Gulf of Alaska
- Water type: Bay
- Progression: Cook Inlet -> Gulf of Alaska -> Pacific Ocean -> Planet Earth
- Climates: Subpolar
- Continents: North America
- Countries: United States of America
Turnagain Arm is a waterway into the northwestern part of the Gulf of Alaska. It is one of two narrow branches at the north end of Cook Inlet, the other being Knik Arm. Turnagain is subject to climate extremes and large tide ranges.