The 11th millennium BC spanned the years 11,000 BC to 10,001 BC (c. 13 ka to c. 12 ka or 12,950 BP to 11,951 BP). This millennium is during the ending phase of the Upper Paleolithic or Epipaleolithic period. It is impossible to date events that happened during this millennium, and all dates associated with this millennium are estimates based on geological analysis, anthropological analysis, and radiometric dating.