| 2023 Open de Oeiras | |
|---|---|
| Date | 17–23 April |
| Edition | 8th |
| Surface | Clay |
| Location | Oeiras, Portugal |
| Champions | |
| Singles | |
 Zsombor Piros | |
| Doubles | |
 Victor Vlad Cornea /  Franko Škugor | |
The 2023 Open de Oeiras was a professional tennis tournament played on clay courts. It was the eighth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Oeiras, Portugal between 17 and 23 April 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 FRA | Adrian Mannarino | 47 | 1 |
| FRA | Alexandre Müller | 96 | 2 |
 AUT | Sebastian Ofner | 120 | 3 |
 ARG | Juan Manuel Cerúndolo | 123 | 4 |
 POR | João Sousa | 146 | 5 |
 JPN | Kaichi Uchida | 160 | 6 |
| HUN | Zsombor Piros | 167 | 7 |
 ITA | Andrea Vavassori | 176 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
Cezar Crețu Jaime Faria 
Billy Harris 
Pablo Llamas Ruiz Daniel Mérida
Petr Nouza The following player received entry as a lucky loser:
Zsombor Piros def. Juan Manuel Cerúndolo 6–3, 6–4. Victor Vlad Cornea / Franko Škugor def. 
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