The Unitarian League (Spanish: Liga Unitaria) also referred to as the League of the Interior (Liga del Interior) was a league of provinces of Argentina led by José María Paz, established in 1830, aiming to unite the country under unitarian principles. It comprised the provinces of San Luis, La Rioja, Catamarca, Mendoza, San Juan, Tucumán, Córdoba, Salta and Santiago del Estero. It was opposed and ultimately defeated by the provinces of the Federal Pact.