The 1976 South American Championships was a men's tennis tournament played on outdoor clay courts in Buenos Aires, Argentina that was part of the 1976 Commercial Union Assurance Grand Prix and held from 22 November through 28 November 1976.

First-seeded Guillermo Vilas won the singles title.

[3] Guillermo Vilas defeated Jaime Fillol 6–2, 6–2, 6–3 Carlos Kirmayr / Tito Vázquez defeated Ricardo Cano / Belus Prajoux 6–4, 7–5