The Nacional de Clubes is the main club competition in Argentine rugby, being contested by a total of 16 teams, 8 from Buenos Aires and 8 from the rest of the provinces of Argentina.

The number of teams were determined were: eight from Buenos Aires, two each from the Noroeste, Litoral and Córdoba and one from both Cuyo and Mar del Plata.

Due to scheduling problems, in 2009 the UAR re-launched the Torneo del Interior, a competition that involved clubs from all provincial unions outside Buenos Aires.

The new formula of this tournament coincided with a complete overhaul of the Nacional de Clubes system, so the competition was contested by only 4 teams, 2 from the Torneo del Interior and 2 from URBA.

The "Nacional de Clubes A" is contested by 16 clubs from the best placed teams of the URBA and regional tournaments.