Club Atlético San Telmo is an Argentine institution based in the Isla Maciel neighborhood of Dock Sud, Buenos Aires, and competes in the Primera Nacional. The club plays its home games at the Estadio Dr. Osvaldo Baletto. Founded in 1904 by workers from the nearby port, the team is nicknamed 'Santo' and has traditional red and white vertical stripes. San Telmo's history is one of a classic neighborhood club, representing the hard-working port community, with many years spent in the lower divisions. A key era was their promotion to the Primera División in the 1970s, a historic achievement for the modest club. Today in the second tier, San Telmo often fights to maintain its status, relying on a mix of experienced professionals and youth products. The fan base, though not massive, is incredibly passionate and local, preserving the club's identity as a symbol of barrio pride and resilience in the vast Argentine football pyramid.