Junín is a city in the province of Buenos Aires, Argentina, and administrative seat of the partido of Junín. It has a population of 85,420 and is located 260 km (162 mi) west of the city of Buenos Aires. It is mostly known for being the hometown of former first lady of Argentina Eva Perón.

Buenos Aires, officially the Buenos Aires Province, is the largest and most populous Argentine province. It takes its name from the city of Buenos Aires, the capital of the country, which used to be part of the province and the province's capital until it was federalized in 1880. Since then, in spite of bearing the same name, the province does not include Buenos Aires city, though it does include all other parts of the Greater Buenos Aires metropolitan area. The capital of the province is the city of La Plata, founded in 1882.