The article presents the Neo-Aramaic dialect of Tin, a village in the Ṣapna valley in northern Iraq, focusing on the dialect’s phonology, morphology, and lexicon. This variety, spoken by Christians of the Chaldean Catholic Church, is most closely related to the nearby Christian dialect of Aradhin, but is nevertheless distinct in many ways. The synchronic description is supplemented with a comparative and historical perspective, indicating how Tin’s features fit into the NENA dialectal map and how unusual or unexpected forms can be explained by historical developments. Contact influences from Northern Kurdish and vernacular Arabic are also discussed. Interesting features of this dialect include the innovation of an initial /d/ in the Present Base forms of verba primae /ʾ/ and sporadic cases of vowel harmony.