The 2017 Dafabet Northern Ireland Open was a professional ranking snooker tournament that took place between 20 and 26 November 2017 in the Waterfront Hall in Belfast, Northern Ireland. It was the tenth ranking event of the 2017/2018 season and a part of the Home Nations Series. It was the second edition of the Northern Ireland Open. Mark King was the defending champion, but he was beaten 1–4 in the third round (last 32) by Yan Bingtao. By reaching the final Yan became the youngest ever finalist of a ranking event.