The 1977 Monte Carlo Open was a men's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Monte Carlo, Monaco. The tournament was part of the World Championship Tennis (WCT) tour. It was the 71st edition of the event and was held from April 4 through April 10, 1977. Björn Borg won the singles title.
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