Chamorro (Chamorro: Fino' Chamoru or simply Chamoru) is a Malayo-Polynesian (Austronesian) language, spoken on the Mariana Islands (Guam, Rota, Tinian, and Saipan) by about 47,000 people (about 35,000 people on Guam and about 12,000 in the N. Marianas).

The numbers of Chamorro speakers have declined in recent years, and the younger generations are less likely to know the language.^{[according to whom?]} The influence of English has caused the language to become endangered. On Guam (called "Guåhan" by Chamorro speakers, from the word guaha, meaning "have", but its English meaning is, "We Have", from the idea that they had everything they needed,) the number of native Chamorro speakers has dwindled in the last decade or so, while in the Northern Mariana Islands, young Chamorros still speak the language fluently. Various representatives from Guam have unsuccessfully lobbied the United States to take action to promote and protect the language.^{[citation needed]}

It is still common among Chamorro households in the Northern Marianas, but fluency has greatly decreased among Guamanian Chamorros during the years of American rule in favor of American English, which is commonplace throughout the inhabited Marianas.