The 1977 Belgian International Championships was a men's tennis tournament staged at the Leopold Club in Brussels, Belgium that was part of the Grand Prix circuit and categorized as a Two star event.

The tournament was played on outdoor clay courts and was held from 6 June until 12 June 1977.

It was the sixth edition of the tournament and first-seeded Harold Solomon won the singles title.

[3] Harold Solomon defeated Karl Meiler 7–5, 3–6, 2–6, 6–3, 6–4 Željko Franulović / Nikola Pilić and František Pála / Balázs Taróczy final not played, title shared