2004 Campeonato Argentino de Rugby

The Campeonato Argentino de Rugby 2004  was won for the first time by the selection of Cuyo, (Mondoza).

Campeonato
No relegation, the next year the tournament returned to an eight-team formula.

Ascenso
Due to the new format for year 2005 (eight teams in "Campeonato" instead of six, and merging of "Ascenso" ed "Estimulo", there were two promotions and no relations.

Final

 * Tucumán and Mar del Plata promoted to "Campeonato"

Estimulo
Due to the reorder for next season, all the teams were promoted to "Ascenso"