The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands (CNMI; Chamorro: Sankattan Siha Na Islas Mariånas; Carolinian: Commonwealth Téél Falúw kka Efáng llól Marianas), is an insular area and commonwealth of the United States consisting of fifteen islands in the northwestern Pacific Ocean. The CNMI includes all islands in the Mariana Archipelago except Guam, which is the southernmost island of the chain and a separate U.S. territory.

The United States Department of the Interior cites a landmass of 183.5 square miles (475.26 km²). According to the 2010 United States Census, 53,883 people were living in the CNMI at that time. The vast majority of the population resides on Saipan, Tinian, and Rota. The other islands of the Northern Marianas are sparsely inhabited; the most notable among these is Pagan, which for various reasons over the centuries has experienced major population flux, but formerly had residents numbering in the thousands.

The administrative center is Capitol Hill, a village in northwestern Saipan. However, most publications consider Saipan to be the capital because the island is governed as a single municipality.

The first people of the Mariana Islands immigrated at some point between 4000 BC and 2000 BC from Southeast Asia. After first contact with Spaniards, they eventually became known as the Chamorros, a Spanish word similar to Chamori, the name of the indigenous caste system's higher division.

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