The Workers' Revolutionary Party (Spanish: Partido Revolucionario de los Trabajadores, PRT) is a Trotskyist political party of Argentina, mainly active in the 1960s and 1970s.
The origins of the PRT lay in the Revolutionary and Popular Indoamericano Front, founded by Francisco René Santucho in 1958 at Santiago del Estero, Argentina. This was a nationalist, indigenist and revolutionary movement, inspired in part by the ideas of the Peruvian Víctor Raúl Haya de la Torre.
The PRT was created in 1965 by the Santucho brothers as the fusion of three political parties, union-affiliated workers and left-wing revolutionary sectors of the Peronist movement.
In 1968 the PRT adhered to the Trotskyist Fourth International, based in Paris. That same year a related organisation was founded, the ERP (People's Revolutionary Army) that became the strongest rural guerrilla movement in South America during the 1970s. The ERP and the PRT were suppressed by the Argentine military regime during the "Dirty War." ERP commander Roberto Santucho was killed in July 1976.