大平原（英文：Great Plains），又叫北美大平原，係北美洲中部嘅一大塊平原，喺密西西比河西面、洛磯山脈東面、格蘭德河北面，面積約莫130萬平方公里。佢係白堊紀陣時嘅西部內陸海路經歷唨海退之後形成嘅。
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