Club Social y Deportivo Loma Negra (usually known as Loma Negra) is an Argentine sports club based in Olavarría, Buenos Aires Province.

In 1981 Loma Negra was eliminated in the first round although the team had achieved a 1–0 win over Ferro Carril Oeste and two 0–0 ties with the favorite River Plate.

Loma Negra defeated the URSS 1–0 in what has to go down as one of biggest upsets ever.

[3][4] In 1983 the club progressed to the last sixteen stage of the competition and their striker Armando Husillos was the tournament top scorer with 11 goals.

The club have had little success since their heyday in the early 1980s and now plays at amateur level.