  We present a corpus professionally annotated for grammatical error correction
(GEC) and fluency edits in the Ukrainian language. To the best of our
knowledge, this is the first GEC corpus for the Ukrainian language. We
collected texts with errors (20,715 sentences) from a diverse pool of
contributors, including both native and non-native speakers. The data cover a
wide variety of writing domains, from text chats and essays to formal writing.
Professional proofreaders corrected and annotated the corpus for errors
relating to fluency, grammar, punctuation, and spelling. This corpus can be
used for developing and evaluating GEC systems in Ukrainian. More generally, it
can be used for researching multilingual and low-resource NLP, morphologically
rich languages, document-level GEC, and fluency correction. The corpus is
publicly available at https://github.com/grammarly/ua-gec
