Revolutionary Party of the Nationalist Left

The Revolutionary Party of the Nationalist Left (Spanish: Partido Revolucionario de la Izquierda Nacionalista, PRIN) was a left-wing political party in Bolivia. It was founded in 1963 by the labor leader Juan Lechín Oquendo and by Mario Torres Calleja and Edwin Moller in lesser roles. The PRIN seceded from the Revolutionary Nationalist Movement (MNR) in protest against Víctor Paz Estenssoro's decision to seek a third elected term as president in 1964, rather than permit then Vice-President Juan Lechín to have the MNR's presidential nomination.

The PRIN combined the left wing of the MNR and former members of the Revolutionary Workers' Party (POR). The PRIN's ideological position espouses left-wing nationalism, rather than socialism in more traditional terms. It is critical of bourgeois influence in the main body of the MNR.

Electorally, the PRIN abstained in the 1964 and 1966 presidential votes. After the military coup of 1964, the PRIN was forced underground. It was also weakened because Juan Lechín was deported to Paraguay by the military junta, he spent many years in exile between 1965 and 1978. The PRIN was once again suppressed in the 1970s by the military under the presidency of Hugo Banzer.

After 1971, its position as the main party to the left of the MNR was supplanted by a new party formed by Hernán Siles, the Nationalist Revolutionary Movement of the Left (MNRI).

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