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The 11th century in North American history provides a time line of events occurring within the present political boundaries of United States (including territories) from 1001 through 1100 in the Gregorian calendar. Although this time line segment may include some European or other world events that profoundly influenced later American life, it focuses on developments within Native American (and Polynesian) communities. Because the indigenous peoples of these regions lacked a written language, we must glean events from the admittedly very incomplete archaeological record and place them in time through radiocarbon dating techniques.

• Scandinavian Vikings briefly settled Vinland (now l'Anse aux Meadows on the Canadian Maritime island of Newfoundland) early in the century and perhaps ventured as far south as New England.

• The Inuit Thule people began absorbing the old Dorset culture in Arctic Alaska.

• Natives of west-central New Mexico began to inhabit the mesa-top Acoma Pueblo, widely regarded as the oldest continually occupied settlement in the United States, before 1075.