The Peruvian Aprista Party (Spanish: Partido Aprista Peruano, PAP) (listen^ⓘ) is a Peruvian social-democratic political party and a member of the Socialist International. The party was founded as the American Popular Revolutionary Alliance (Spanish: Alianza Popular Revolucionaria Americana, APRA) by Víctor Raúl Haya de la Torre, who originally intended to create a network of anti-imperialist social and political movements in Latin America. Members are called "compañeros" (fellows), based on the fraternity espoused by Haya de la Torre. Originally a centre-left to left-wing party with democratic socialist and nationalist elements (in addition to the aforementioned anti-imperialism), the party moved closer to the political centre under the leadership of Alan García starting in the 1980s, embracing social democracy and later some Third Way policies. In 2006, the party adopted a new platform as García's second presidency implemented a series of policies labelled as centre-right, embracing free-market capitalism, dialogue with other right-wing parties and organizations in the country, and closer ties with the Catholic Church and Evangelical churches.

Founded continentally in 1924 in Mexico City, Mexico, and nationally in 1930 in Lima, it is one of the oldest political parties in Latin America. Among the Peruvian political parties in activity, specifically for having been stripped of electoral victories by coups or military governments after having triumphed democratically, it also went through two long periods of illegality, both under military and civilian governments, having been persecuted by the presidencies of Luis Miguel Sánchez Cerro and Manuel A. Odría. The Peruvian Aprista Party has gained in the presidency in two occasions: in 1985 and 2006, both under the candidacy of Alan García. At parliamentary level, the party was represented uninterrupted from 1995 until 2020, falling below the electoral threshold to attain legislative representation.

Although APRA does not operate throughout Latin America as its founder envisioned for, it has served as a powerful influence for other social democratic Latin American political organizations, such as Democratic Action (AD) in Venezuela and the Socialist Party of Chile.

APRA was founded by Víctor Raúl Haya de la Torre in Mexico City on 7 May 1924 with aspirations to becoming a continent-wide party, and it subsequently influenced a number of other Latin American political movements, including Bolivia's Revolutionary Nationalist Movement (Movimiento Nacionalista Revolucionario, MNR), Dominican Republic's Dominican Revolutionary Party (Partido Revolucionario Dominicano, PRD) and Costa Rica's National Liberation Party (Partido Liberación Nacional, PLN). The party was inspired by Haya de la Torre's observations of fascist and communist parties during his time in Europe.

Initial supporters for APRA in the 1920s mainly included middle-class and wealthy Peruvians who were upset with the sugar industry's modernization. It appealed to left-wing Peruvian intellectuals, as well as the nascent Peruvian labor movement. It is the oldest surviving political party in Peru and is as much a social phenomenon as a political movement, with a membership whose loyalty to the party has been unwavering for several generations. APRA initially espoused anti-imperialism, Pan-Americanism, international solidarity and economic nationalism. Years of repression and clandestinity, as well as Haya de la Torre's single-handed dominance of the party, resulted in striking sectarian and hierarchical traits. The party's structure and its hold over its rank and file proved more lasting than its original ideological platform.

In the 1930s, the party was banned after being inaccurately labeled as communist; Italy and the United States supported the ban as they believed APRA served as a front group for bolshevism. The conflict between APRA and the authoritarian government of Luis Miguel Sánchez Cerro led to civil war-like conditions. On 2 July 1932, APRA militants massacred sixty soldiers in Trujillo, which resulted in a violent response from President Sánchez Cerro that resulted with about 1,500 Apristas killed and the arrest of Haya de la Torre. Abelardo Mendoza Leyva, an Aprista, later assassinated President Sánchez Cerro on 30 April 1933.

In 1944, APRA formed the National Democratic Front political coalition beside the far-right Reformist Democratic Party and the fascist Revolutionary Union party, excluding the Peruvian Communist Party. The alliance led to the triumph of ultraconservative José Luis Bustamante y Rivero becoming president the same year. In the late 1950s, APRA moved towards the political right. Many of its left-wing supporters disillusioned.

After several years of military rule, APRA was allowed to participate as a legal political party in 1979. The party gathered strong support from the electorate, managing to win a majority of seats in the newly created Constituent Assembly, and supervised the first democratic elections in 12 years.