| 1998 Estoril Open | |
|---|---|
| Date | 6–13 April |
| Edition | 9th |
| Surface | Clay / outdoor |
| Location | Oeiras, Portugal |
| Champions | |
| Men's singles | |
 Alberto Berasategui[1] | |
| Women's singles | |
 Barbara Schwartz | |
| Men's doubles | |
 Donald Johnson / Francisco Montana[2] | |
| Women's doubles | |
 Caroline Dhenin / Émilie Loit | |
The 1998 Estoril Open was a tennis tournament played on outdoor clay courts. This event was the 9th edition of the Estoril Open, included in the 1998 ATP Tour International Series and in the 1998 ITF Women's Circuit. Both the men's and the women's events took place at the Estoril Court Central, in Oeiras, Portugal, from 6 April until 13 April 1998.
- ^ "1998 Estoril – Singles draw". Association of Tennis Professionals (ATP).
- ^ "1998 Estoril – Doubles draw". Association of Tennis Professionals (ATP).