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| 2023 Estoril Open | |
|---|---|
 | |
| Date | 3 – 9 April |
| Edition | 8th |
| Category | ATP Tour 250 |
| Draw | 28S / 16D |
| Prize money | €562,815 |
| Surface | Clay / outdoor |
| Location | Cascais, Portugal |
| Venue | Clube de Ténis do Estoril |
| Champions | |
| Singles | |
 Casper Ruud | |
| Doubles | |
 Sander Gillé / Joran Vliegen | |
The 2023 Estoril Open (also known as the Millennium Estoril Open for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts. It was the 8th edition of the tournament and part of the ATP Tour 250 series of the 2023 ATP Tour. It took place at the Clube de Ténis do Estoril in Cascais, Portugal, from 3 to 9 April 2023.[1]
- ^ "Millennium Estoril Open Overview". atptour.com.