The Comoros (ˈkɒməroʊz; Arabic: جزر القمر‎, Ǧuzur al-Qumur/Qamar), officially the Union of the Comoros (Comorian: Udzima wa Komori, French: Union des Comores, Arabic: الاتحاد القمري‎ al-Ittiḥād al-Qumurī/Qamarī) is an archipelago island nation in the Indian Ocean, located off the eastern coast of Africa, on the northern end of the Mozambique Channel, between northeastern Mozambique and northwestern Madagascar. Other countries near to the Comoros are Tanzania to the northwest and the Seychelles to the northeast. The capital is Moroni on Grande Comore.

At 1,862 km2 (719 sq mi) (excluding Mayotte), the Comoros is the third-smallest African nation by area. With a population estimated at 798,000 (excluding Mayotte), it is the sixth-smallest African nation by population—although it has one of the highest population densities in Africa. Its name derives from the Arabic word القمر qamar ("moon"). The archipelago is notable for its diverse culture and history, as a nation formed at the crossroads of many civilizations. It is the southernmost member state of the Arab League. Though in the contested island of Mayotte the sole official language is French, the "Union of the Comoros" has three official languages: Comorian, Arabic, and French.