Plaza 30'000 compañeros, Memorial square in Buenos Aires, Argentina

Plaza 30'000 compañeros is a memorial square in Buenos Aires, Argentina. It lies beneath the Autopista 25 de Mayo, directly across from the former Club Atlético detention center, and features walls with painted messages and a small open area.

The square was created as a memorial site in front of the former Club Atlético detention center, which operated during the military dictatorship. In 2018, it hosted the opening of the "Gráfica del Exilio" exhibition to mark the International Day of the Disappeared.

The name refers to the 30,000 people who disappeared during Argentina's last dictatorship, and the square is used for ceremonies and gatherings that keep their memory alive. On August 23, a Pachamama ceremony is held here, organized by the memory space, a local school, and the ethnographic museum.

The square is open all day and is easy to reach on foot from nearby streets. Visitors should approach from Paseo Colón and look for the space under the highway overpass.

In 2026, a denialist graffiti with the number "8,000" appeared on one of the walls, and a gathering was held to reject it. The square is also known as "30,000 compañerxs" in inclusive language.