The 1990 Monte Carlo Open was a men's tennis tournament played on outdoor clay courts. It was the 84th edition of the Monte Carlo Open, and was part of the ATP Super 9 of the 1990 ATP Tour. It took place at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France, near Monte Carlo, Monaco, 23 April through 29 April 1990.
The men's field was headlined by Stefan Edberg and Boris Becker. Other top seeds in the field were Aaron Krickstein, Jay Berger, and Andrés Gómez.
Andrei Chesnokov defeated Thomas Muster 7–5, 6–3, 6–3
- It was Andrei Chesnokov's 1st title of the year and his 4th overall. It was his 1st Masters title.
Petr Korda / Tomáš Šmíd defeated Andrés Gómez / Javier Sánchez 6–4, 7–6