科罗拉多州（英语：State of Colorado）是美国西部的一州，此州最著名的是拥有洛矶山脉的最高峰，地形从东侧的平原陡然升高为西侧峻岭，地理景观十分壮丽。该州首府兼最大城为丹佛。在整个丹佛的都会区中就包含了该州半数以上的人口总数（约250万人，全州共有约505万人）。科罗拉多州是以西班牙语“Colorado”命名的，意为“红色的”，估计这可能指的是该地区红色的砂岩地层或是科罗拉多河两岸的赭红色景观。

科罗拉多州的邮政缩写是CO。美国海军以该州命名了USS Colorado战舰。

Colorado (/kɒləˈrædoʊ/, or /kɒləˈrɑːdoʊ/) (Spanish for "ruddy") is a state in the United States encompassing most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is part of the Western United States, the Southwestern United States, and the Mountain States. Colorado is the 8th most extensive and the 22nd most populous of the 50 United States. The United States Census Bureau estimates that the population of Colorado was 5,456,574 on July 1, 2015, an increase of 8.50% since the 2010 United States Census.