The Regional Rugby Championship is an annual rugby union competition involving sides from Bosnia-Herzegovina, Croatia, Hungary, Montenegro, Serbia and Slovenia.

This was a successor to the Interliga between clubs from Bosnia-Herzegovina, Croatia and Slovenia which started in 2004/2005.

In the past the Championship has also featured teams from Austria and Bulgaria, and invitations to teams from Greece.

Currently six teams qualify each season, based on their performance in national championships.

The 2019/2020 season was suspended due to the COVID-19 pandemic.