Davidof Island (Qanan-tanax̂ in Aleut) is an island in the Rat Islands archipelago of the Western Aleutian Islands, Alaska. Davidof Island is irregular in shape with a north-south length of 2 miles and a greatest width of 0.7 mile. The high point in the south part is 1,074 feet, and the summit in the north part is 922 feet high. Rocks on the north part of the island are hydrothermally altered.