The 1990 Diet Pepsi Championships was a men's tennis tournament played on indoor carpet courts at the Wembley Arena in London, England.

It was part of the 1990 ATP Tour.

It was the 15th and last edition of the tournament and was held from 5 November until 11 November 1990.

Seventh-seeded Jakob Hlasek won the singles title.

[3] Jakob Hlasek defeated Michael Chang, 7–6, 6–3 Jim Grabb / Patrick McEnroe defeated Rick Leach / Jim Pugh, 7–6, 4–6, 6–3