This is a list of rivers of Argentina.

Longest Rivers

By drainage basin

This list is arranged by drainage basin, with respective tributaries indented under each larger stream's name. Rivers in the table above are in bold.

La Plata Basin

• Río de la Plata
  • Uruguay River
    • Gualeguaychú River
    • Mocoretá River
    • Miriñay River
    • Aguapey River
    • Pepiri-Guazu River
  • Paraná River
    • Arrecifes River
    • Gualeguay River
    • Nogoyá River
    • Arroyo del Medio
    • Saladillo Stream
    • Ludueña Stream
    • Carcarañá River
      • Tercero River (Calamuchita River)
      • Cuarto River (Saladillo River, Chocancharava River)
    • Salado River (Salado del Norte, Juramento River, Pasaje River, Calchaquí River)
      • Horcones River
        • Urueña River
      • Arenales River
      • Rosario River
      • Guasamayo River
    • San Javier River
    • Feliciano River
    • Guayquiraró River
    • Corriente River
    • Paraná Miní River
      • Tapenagá River
      • Palometa River
    • Santa Lucía River
    • Negro River
    • Guaycurú River
    • Paraguay River
      • Río de Oro
      • Bermejo River (Teuco River)
        • Bermejito River
          • Dorado River
        • Teuquito River
        • Seco River
        • San Francisco River
          • Grande River
          • Mojotoro River (Lavayén River)
        • Pescado River
          • Iruya River
        • Río Grande de Tarija
          • Itaú River
        • Lipeo River
      • Pilcomayo River
        • Pilaya River (Bolivia)
          • San Juan del Oro River (Bolivia)
            • Río Grande de San Juan
    • Urugua-í River
    • Iguazu River
      • San Antonio River
  • Luján River
    • Reconquista River
  • Matanza River (Riachuelo)
• Samborombón Bay
  • Samborombón River
  • Salado River

Atlantic Ocean - Patagonia

• Quequén Grande River
• Sauce Grande River
• Naposta Stream
• Sauce Chico River
• Colorado River
  • Desaguadero River (Salado River, Bermejo River, Vinchina River) (usually does not reach the Colorado)
    • Atuel River
    • Diamante River
    • Tunuyán River
    • San Juan River
      • Mendoza River
        • Tupungato River
      • Castaño Viejo River
      • Calingasta River
      • Río de los Patos
        • Blanco River
    • Jáchal River
      • Blanco River
    • Huaco River
  • Barrancas River
  • Grande River
• Río Negro
  • Neuquén River
    • Agrio River
  • Limay River
    • Collón Curá River
      • Aluminé River
      • Chimehuin River
    • Traful River
• Chubut River
  • Chico River
    • Senguerr River
      • Mayo River
        • Guenguel River
  • Tecka River
  • Chico River
• Deseado River
  • Pinturas River
  • Fénix Grande River
• Santa Cruz River
  • Chico River
    • Chalía River (Shehuen River)
    • Belgrano River
  • La Leona River
• Coig River (Coyle River)
  • Pelque River
• Gallegos River
  • Chico River
• Grande River
• Fuego River

Pacific Ocean (Argentina - Chile)

• Futaleufú River
  • Percey River
  • Corintos River
• Hua-Hum River
• Mayer River
• Palena River
• Pico River
• Puelo River
• Simpson River
• Vizcachas River

Interior basins

• Carapari River
  • Itiyuro River
• Tartagal River
• Salado River (Colorado River)
  • Belén River
  • Abaucán River
• Mar Chiquita (Córdoba)
  • Dulce River
    • Saladillo River
    • Salí River
  • Primero River (Suquía River)
    • Cosquín River
  • Segundo River (Xanaes River)
• Cruz del Eje River
• Conlara River
• Quinto River (Popopis River)
• Malargüe River

Alphabetically