Elite Ice Hockey Leagues
As well as playing in the Elite Ice Hockey League (England, Scotland, Wales, Northern Ireland), the Belfast Giants can compete in the Champions Hockey League (European Champions League)
Celtic Ice Hockey Leagues
As well as the Elite Ice Hockey League (England, Scotland, Wales, Ireland – Pro Level 4 (A) in the National Hockey League (North America) system), there are also Celtic or Scottish Leagues which Irish teams have participated in since the 1980s, forming a bridge between the Pro Levels (EIHL) and the purely recreational or amateur Irish Leagues.
In the 1980s and 1990s teams from Castlereagh, based at Dundonald Ice Bowl entered Scottish or Northern English / Scottish Leagues, and then from 2008 to 2010 teams from both Dundonald and Dundalk Ice Bowls entered the Celtic League, which was more evenly distributed between Irish and Scottish sides.