The 1974 South American Championships was a men's tennis tournament for male players that was part of the 1974 Commercial Union Assurance Grand Prix.

It was played in Buenos Aires, Argentina, and held from 18 November through 24 November 1974.

First-seeded Guillermo Vilas won the singles title.

[3] Guillermo Vilas defeated Manuel Orantes 6–3, 0–6, 7–5, 6–2 Manuel Orantes / Guillermo Vilas defeated Patricio Cornejo / Jaime Fillol 6–4, 6–3