The Alaska Peninsula is a peninsula extending about 800 km (497 mi) to the southwest from the mainland of Alaska and ending in the Aleutian Islands. The peninsula separates the Pacific Ocean from Bristol Bay, an arm of the Bering Sea.

In literature (especially Russian) the term ‘Alaska Peninsula’ was used to denote the northwest part of North America, or all of what is now the state of Alaska with the exception of the Aleutian Islands and the Alaska Panhandle.