北马里亚纳群岛自由邦（查莫罗语：Sankattan Siha Na Islas Mariånas；英语：Commonwealth of the Northern Mariana Islands，缩写「CNMI」）是美国的一个自由邦，位于北太平洋上的战略要地。它包括了15个岛屿，总长685英里，位于夏威夷到菲律宾约四分之三的距离上。北马里亚纳群岛在2010年的正式人口普查里有5万9221人。北马里亚纳群岛总面积为463.63km²（179.01sq. mi）。群岛包括了塞班岛、罗塔岛、和天宁岛等。北马里亚纳群岛属热带海洋性气候，终年如夏。

The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands (CNMI; Chamorro:Sankattan Siha Na Islas Mariånas), is one of five inhabited American insular areas. It is one of two territories with US "commonwealth" status; the other is Puerto Rico. It consists of fifteen islands in the northwestern Pacific Ocean. The CNMI and Guam together comprise the Marianas archipelago.