阿拉斯加州（英语：State of Alaska），是位于美国西北太平洋沿岸、第49个加入美利坚合众国的一个州，也是美国面积最大的州、世界最大的飞地地区。由于地理上处于高纬度地区，阿拉斯加人趣称美国本土为「低（纬）四十八（州）」（Lower Forty-eight）。阿拉斯加州东接加拿大的育空、英属哥伦比亚，南邻阿拉斯加湾、太平洋，西濒白令海、白令海峡、楚科奇海，与俄罗斯楚科奇自治区相望，北临北冰洋。

「阿拉斯加」（Аляска）这个名称是在俄属北美时期引入的，当时是用来指阿拉斯加半岛。阿拉斯加这词来自于阿留申语的一熟语，象征的指整个阿拉斯加。从字面上来理解，意思为「object to which the action of the sea is directed」或者源于阿留申语的「Alyeska」一词，意思是「很大的陆地」。

Alaska (/əˈlæskə/) is a U.S. state situated in the northwest extremity of the Americas. The Canadian administrative divisions of British Columbia and Yukon border the state to the east; it has a maritime border with Russia to the west across the Bering Strait. To the north are the Chukchi and Beaufort Seas, the southern parts of the Arctic Ocean. The Pacific Ocean lies to the south and southwest. Alaska is the largest state in the United States by area, the 3rd least populous and the least densely populated of the 50 United States. Approximately half of Alaska's residents (the total estimated at 738,432 by the Census Bureau in 2015) live within the Anchorage metropolitan area. Alaska's economy is dominated by the fishing, natural gas, and oil industries, resources which it has in abundance. Military bases and tourism are also a significant part of the economy.