Unión San Martín is a Peruvian football club located in the city of Pisco, Peru.

In 2016 Copa Perú, the club qualified to the Departamental Stage, but was eliminated by Francisco Oropeza in the Quarterfinals.

[1] In 2017 Copa Perú, the club qualified to the National Stage, but was eliminated by Binacional in the Quarterfinals.

In 2019 Copa Perú, the club qualified to the Provincial Stage, but was eliminated by Las Américas in the Semifinals.

In 2021 Copa Perú, the club qualified to the National Stage, but was eliminated when it finished in 6th place.