| 2025 Clube Tenis Porto Challenger | |
|---|---|
| Date | 25 August – 1 September |
| Edition | 2nd |
| Surface | Clay |
| Location | Porto, Portugal |
| Champions | |
| Singles | |
 Guy den Ouden | |
| Doubles | |
 Szymon Kielan / Filip Pieczonka | |
The 2025 Clube Tenis Porto Challenger was a professional tennis tournament played on clay courts. It was the second edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Porto, Portugal between 25 August and 1 September 2025.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 BRA | Thiago Seyboth Wild | 140 | 1 |
| NED | Guy den Ouden | 157 | 2 |
 POR | Henrique Rocha | 168 | 3 |
 ARG | Alex Barrena | 229 | 4 |
 SWE | Elias Ymer | 233 | 5 |
 KAZ | Dmitry Popko | 239 | 6 |
| ARG | Genaro Alberto Olivieri | 259 | 7 |
| POR | Frederico Ferreira Silva | 262 | 8 |
The following players received wildcards into the singles main draw:
Pedro Araújo Francisco Rocha Henrique Rocha The following player received entry into the singles main draw through the Next Gen Accelerator programme:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Max Alcalá Gurri David Jordà Sanchis 
Maxwell McKennon Filip Pieczonka Tiago Torres Olle Wallin Guy den Ouden def. 
Gilles-Arnaud Bailly 6–4, 6–2. Szymon Kielan / Filip Pieczonka def. 
Ivan Sabanov / Matej Sabanov 6–2, 6–4.
