科迪亚克岛（Kodiak Island），美国阿拉斯加州南部一岛屿，位于阿拉斯加湾西部，距离安克雷奇250英里。

该岛是科迪亚克群岛的主岛，也是阿拉斯加州第一大岛和仅次于夏威夷大岛的美国第二大岛，面积8975平方公里，常住人口约6000人，其中爱斯基摩人超过2000人。岛上经济以渔业为主，盛产大马哈鱼和鳕鱼。

1784年，俄罗斯在该岛设立殖民据点，1867年随阿拉斯加被授予美国至今。设有"卫星发射场"「Kodiak LP-1」。

科迪亚克岛被认为是灰熊在25万年前演化成为阿拉斯加棕熊的所在地。

Kodiak Island is a large island on the south coast of the U.S. state of Alaska, separated from the Alaska mainland by the Shelikof Strait. The largest island in the Kodiak Archipelago, Kodiak Island is the second largest island in the United States and the 80th largest island in the world, with an area of 9,311.24 km (3,595.09 sq mi)., slightly larger than Cyprus. It is 160 km (99 miles) long and in width ranges from 16 to 97 kilometres (10 to 60 mi). Kodiak Island is the namesake for Kodiak Seamount, which lies off the coast at the Aleutian Trench. The largest community on the island is the city of Kodiak, Alaska.