The United Nations International School (UNIS) is a private international school in New York City which was established in 1947. Today, UNIS has over 1,600 students in one campus in Manhattan, close to the Headquarters of the United Nations. The Manhattan campus, overlooking the East River, is K-12; until 2022, the school also ran a K-8 school at a campus in Jamaica Estates, Queens.

UNIS was one of the pilot schools of the International Baccalaureate (IB) and was among those awarding the first IB diplomas. The comprehensive K–12 curriculum prepares UNIS students for the IB, and the school's internationally recognized academic standards attempts to enable students to go on to study in top colleges/universities both in the United States and the rest of the world.

UNIS is a member of the Council of International Schools, the International Baccalaureate Organization, the European Council of International Schools, the New York State Association of Independent Schools, the National Association of Independent Schools and the College Board along with being registered to the New York Board of Regents as an independent, not-for-profit school.