1977 ATP Buenos Aires
Date	21–27 November
Edition	11th
Category	Grand Prix circuit (Two star)
Draw	32S / 16D
Prize money	$75,000
Surface	Clay / outdoor
Location	Buenos Aires, Argentina
Champions
Singles
Guillermo Vilas[1]
Doubles
Ion Țiriac / Guillermo Vilas[2]
← 1976 · ATP Buenos Aires · 1978 →

The second 1977 ATP Buenos Aires was a men's tennis tournament held in Buenos Aires, Argentina that was part of the Grand Prix circuit and played on outdoor clay courts. It was the 11th edition of the tournament and was held from 21 November through 27 November 1977. First-seeded Guillermo Vilas won the singles title.

Guillermo Vilas defeated Jaime Fillol Sr. 6–2, 7–5, 3–6, 6–3

• It was Vilas's 19th title of the year and the 46th of his career.

Ion Țiriac / Guillermo Vilas defeated Ricardo Cano / Antonio Muñoz

• It was Tiriac's 6th title of the year and the 18th of his career. It was Vilas's 18th title of the year and the 45th of his career.

• ITF tournament edition details
• ATP tournament profile