| 1989 Estoril Open | |
|---|---|
| Date | 17–23 July |
| Edition | 1st |
| Category | Category 2 |
| Draw | 32S / 16D |
| Prize money | $100,000 |
| Surface | Clay |
| Location | Oeiras, Portugal |
| Venue | Estoril Court Central |
| Champions | |
| Singles | |
 Isabel Cueto | |
| Doubles | |
 Iva Budařová / Regina Rajchrtová | |
The 1989 Estoril Open was a women's tennis tournament played on outdoor clay courts at the Estoril Court Central in Oeiras, Portugal that was part of the Category 2 tier of the 1989 WTA Tour. It was the first edition of the tournament and was held from 17 July through 23 July 1989. Third-seeded Isabel Cueto won the singles title.