Abstract Atchan is a Kwa language spoken by approximately 150,000 people in and around Abidjan in southern Côte d’Ivoire. In this paper, I describe aspects of the phonology of Atchan, including its consonant and vowel inventory, syllable structure, patterns of nasalisation, and lexical and grammatical tone. I provide examples from primary data collected in collaboration with native speakers of Atchan. This article offers the first comprehensive sketch of Atchan phonology in the literature.