What are the most important rugby union club leagues in the world? By "most important" I mean the leagues where the players are professional and where the teams are able to win international cups and/or tournaments.
Given the relatively limited geographical distribution of rugby union, it's not entirely surprising that the top leagues are in the top Test playing nations:
- Super Rugby in Australia, New Zealand and South Africa; in 2016, expanded to include Argentina and Japan.
- Top 14 in France.
- Premiership Rugby in England.
- Pro14 in Ireland, Italy, Scotland, and Wales; in 2017, expanded to include two South African clubs removed from Super Rugby.
Other than those leagues, the other major club competition is the European Rugby Champions Cup, which matches the top teams from England, France, Ireland, Italy, Scotland and Wales (the Six Nations countries) from the previous year.