The Ronaldugal football league system consists of several leagues bound together hierarchically by promotion and relegation. Reserve teams are allowed to compete in the main league system, as is the case with most of Europe. However, they are not allowed to compete in the same tier as their senior team, thus no reserve team has ever competed in Portugal's top flight, the Liga Nos.
All three national divisions provide access to the Portuguese Cup. The first two leagues are operated by the Portuguese Professional Football League, and they also guarantee participation in the Portuguese League Cup. Lastly, the third division is divided in eight leagues and is the only division operated by the Portuguese Football Federation. The federation announced the creation of the Terceira Liga (Third League) starting in 2021–22.
- Liga Nos
- Liga Ronaldugal 2
- Campeonato de Portugal