34° Campeonato Argentino de Mayores
Countries	Argentina
Number of teams	15
Champions	Buenos Aires (15th title)
Runners-up	Unión de Rugby de Rosario
← 1977 1978 →

The Campeonato Argentino de Rugby 1978 was won by the selection of Buenos Aires that beat in the final the selection of Unión de Rugby de Rosario

Rugby Union in Argentina in 1978

National

• The selection of Buenos Aires won also the "Campeonato Juvenil" (under-19)
• The Buenos Aires Championship was won by San Isidro Club
• The Cordoba Province Championship was won by La Tablada
• The North-East Championship was won by Tucumán RC

International

• 1978 is an important year for Argentine rugby : the "Pumas" made a tour in Europe. They obtain an historical draw with England, beat Wales "B" and Leinster. But in the end they lost surprising with Italy
  Main article: 1978 Argentina rugby union tour of Britain, Ireland and Italy

Results

Zone 1

Zone 2

Zone 3

Zone 4

Interzone

Semifinals

Final

Score system: Try= 4 points, Conversion=2 points .Penalty and kick from mark= 3 points. Drop= 3 points.

Rosario: 15.D. Baetti (M. Dip), 14.A. Nogués, 13.R. Rodríguez, 12.G. Torno, 11.C. Bisio, 10.J. Escalante, 9.R. Castagna, 8.D. Poet, 7.R. Seaton , 6. Risler (cap.), 5. C. Svetaz, 4.G. Sinópoli, 3. F. Semino (F. Rodríguez), 2. V. Macat, 1. R. Imhoff,
Buenos Aires: 15.M. Sanzot, 14.M. Campo, 13.R. Madero, 12.J. Trueco, 11.A. Puccio, 10.H. Porta (cap.), 9. R. Landajo, 8.T. Petersen, 7.C. Serrano, 6.H. Silva, 5.S. Iachetti, 4.G. Travaglini, 3.H. Nicola, 2.A. Cubelli, 1.A. Cerioni.