The Neo-Aramaic dialect of the Assyrian Christians of Urmi is drastically losing its speakers who abandoned their villages of origin as a consequence of the tragic events of the last century. This article is a result of the fieldwork conducted by the author in 2012 in Tehran, with the purpose of examining the vitality of this endangered Neo-Aramaic variety in Iran, more specifically in the capital city, where since the 4th decades of the 20th century a large community of Assyrians is found. The author sketches the sociolinguistic situation of the Assyrians of Tehran, using interviews, self-declarations and materials collected on the field