The Catholic Church in Argentina is part of the worldwide Catholic Church, under the spiritual leadership of the Pope and curia in Rome.

The Roman Catholic Church is the world's largest Christian Church, and its largest religious grouping. There are an estimated 33 Million baptised Catholics in Argentina, roughly 89% of the population.

Within Argentina the hierarchy consists of:

• Bahía Blanca
  • Alto Valle del Río Negro
  • Comodoro Rivadavia
  • Río Gallegos
  • San Carlos de Bariloche
  • Santa Rosa
  • Viedma

• Buenos Aires (Cardinal Archbishop)
  • Avellaneda-Lanús
  • Gregorio de Laferrere
  • Lomas de Zamora
  • Merlo-Moreno
  • Morón
  • San Isidro
  • San Justo
  • San Martín
  • San Miguel

• Córdoba
  • Cruz del Eje
  • San Francisco
  • Villa de la Concepción del Río Cuarto
  • Villa María

• Corrientes
  • Goya
  • Posadas
  • Puerto Iguazú
  • Santo Tomé

• La Plata
  • Azul
  • Chascomús
  • Mar del Plata
  • Nueve de Julio
  • Quilmes
  • Zárate-Campana

• Mendoza
  • Neuquén
  • San Rafael

• Mercedes-Luján (immediately subject to Vatican)

• Paraná
  • Concordia
  • Gualeguaychú

• Resistencia
  • Formosa
  • San Roque de Presidencia Roque Sáenz Peña

• Rosario
  • San Nicolás de los Arroyos
  • Venado Tuerto

• Salta
  • Catamarca
  • Jujuy
  • Orán

• San Juan de Cuyo
  • La Rioja
  • San Luis

• Santa Fe de la Vera Cruz
  • Rafaela
  • Reconquista

• Tucumán
  • Añatuya
  • Concepción
  • Santiago del Estero

There are also Maronite, Armenian Catholic, Ukrainian Greek Catholic, and Melkite jurisdictions in Buenos Aires.