The 2018 Asia Rugby Championship was the fourth annual rugby union series for the top-level Asia Rugby nations. The Asia Rugby Championship in 2018 formed part of the World Cup qualifying process and, as such, did not include Japan who had already qualified as the 2019 Rugby World Cup host. Hong Kong and South Korea were joined by Malaysia, promoted from Division 1, to compete in the 2018 series. Other Asian nations played in the lower division tournaments.