Knight Island is an island in western Prince William Sound of the Gulf of Alaska in the state of Alaska, USA.
The island has a land area of 277.166 km² (107.014 sq mi) and no resident population as of 2000.[1] The majority of the island is a part of Chugach National Forest; Alaska native corporations Chugach Alaska Corporation and Chenega Corporation are the two other major landowners.[2]
Shorelines on the eastern and northwestern part of the island were heavily covered in oil after the Exxon Valdez oil spill, northeast of the island, in 1989.[3]