Don Osvaldo is an Argentine rock band from Greater Buenos Aires, established in November 2010 following the dissolution of Callejeros. Led by vocalist Patricio Santos Fontanet, the band initially performed as Casi Justicia Social (CJS), featuring Christián Torrejón, Álvaro Puentes, Abel Pedrello, and Luis Lamas. The group performed its debut concert on 30 November 2010 in Córdoba. Following hiatuses caused by the members' legal involvement in the Republic of Cromañón case, the band rebranded as Don Osvaldo in September 2014, honoring musician Osvaldo Pugliese. Their debut studio album, Casi Justicia Social, appeared on 4 December 2015, featuring the tracks “Suerte” and “Misterios”. This was followed by Casi Justicia Social II (2019) and Flor de Ceibo (2022). The group’s singles include “Bienvenidos”, “Normal”, and “Estampita”. In 2025, the band performed its first sold-out stadium shows in Capital Federal at All Boys Stadium and released the DVD Zona Liberada. The lineup also includes Gastón Videla, Juan Julio Falcone, Gabriel Gerez, Leopoldo Janin, and Enzo Sánchez.
