The 1990 Geneva Open was a men's tennis tournament played on outdoor clay courts that was part of the World Series of the 1990 ATP Tour.

It was the 11th edition of the tournament and was played at Geneva in Switzerland from 10 September through 17 September 1990.

Second-seeded Horst Skoff won the singles title.

[3] Horst Skoff defeated Sergi Bruguera 7–6(10–8), 7–6(7–4) Pablo Albano / David Engel defeated Neil Borwick / David Lewis 6–3, 7–6