The 1955 Campeonato Argentino de Rugby was won by the selection of Capital that beat in the final the selection of Buenos Aires Province ("Provincia").
Rugby Union in Argentina in 1955 The "Buenos Aires Championship" was won by Club Atlético San Isidro The "Cordoba Province Championship" was won by Córdoba Athletic Club The "North-East Championship" was won by Natación y Gimnasia
Knock out stages The championship suffer a lot of trouble due to the political situazion in the country with the deposing of Juan Domingo Perón during the Revolución Libertadora.
The selection of Río Paranà didn't participate and the selection of San Juan withdraws from Quarters of finals after the delay of the match scheduled for 19 September, refusing to play on 2 October.
PRELIMINARY Mar del Plata-Rio Cuarto9 - 6Mar del Plata11 September Cuyo-Rosario6 - 21Rosario
QUARTERS OF FINALS2 OctoberMar del Plata-Provincia0 - 50Mar del Plata2 OctoberUR del Norte-San Juan3 - 0(withdraw)2 OctoberRosario-Capital6 - 23Rosario2 OctoberLa Plata-UR del centro del Pais14 - 3C.A.S.I., Buenos Aires
SEMIFINALS9 OctoberCapital-UR del Norte11 - 3C.A.S.I., Buenos Aires9 OctoberProvincia-La Plata31 - 11Gymn. y Esgr., Buenos Aires
Final
Bibliography Memorias de la UAR 1955 XI Campeonato Argentino