The 1977 Monte Carlo Open was a men's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France.

The tournament was part of the World Championship Tennis (WCT) tour.

It was the 71st edition of the event and was held from 4 April through 10 April 1977.

Björn Borg won the singles title and the accompanying $30,000 first-prize money.

[3][4] Björn Borg defeated Corrado Barazzutti 6–3, 7–5, 6–0 François Jauffret / Jan Kodeš defeated Wojciech Fibak / Tom Okker 2–6, 6–3, 6–2