Parque Nicolás Avellaneda, Public park in Parque Avellaneda district, Buenos Aires, Argentina.

Parque Nicolás Avellaneda is a public park in the Parque Avellaneda district spanning roughly 30 hectares with diverse tree species throughout. The grounds include sports facilities, an athletics track, swimming pools, and two historic buildings that serve cultural and exhibition purposes.

The land began as an orchard managed by a religious community during the 18th century, then became the Olivera family estate in 1828. This transition from agricultural use to private ownership left its mark on the layout and buildings that exist today.

The Casona de los Olivera hosts exhibitions that showcase local art and heritage, while El Tambo operates as a performance space for concerts and theater. These venues give the park a cultural life beyond its natural setting.

The park sits at the intersection of Avenida Directorio and Lacarra, making it convenient to reach by public transportation. Visitors can tailor their time based on interests, choosing between sports facilities, walking paths, and cultural events happening throughout the grounds.

The miniature train Clemente Onelli installed at the Buenos Aires Zoo in 1909 was moved to the park in 1929 and began regular service as the "Expreso Alegría" in 1936. Its circuit of about fifteen minutes passes landmarks such as the Casona de los Olivera.