Retiro-San Martín, or simply Retiro, is one of the six large mainline railway station termini in Buenos Aires, Argentina.

Located in the neighborhood of Retiro, it serves as terminal station for the San Martín Line that runs local trains to the northwestern suburbs of the Buenos Aires metropolitan area.

It also functions as terminal station for the national train General San Martín Railway.

Retiro San Martín is accessible by the C line of the Buenos Aires Metro system and by numerous local public bus services.

The station was inaugurated in 1912 by the Buenos Aires and Pacific Railway (BAP), as part of the extension of the service from Palermo through the city with brick bridges.