| 2025 Olbia Challenger | |
|---|---|
| Date | 13–19 October |
| Edition | 3rd |
| Surface | Hard |
| Location | Olbia, Italy |
| Champions | |
| Singles | |
 Luca Van Assche | |
| Doubles | |
| Arthur Reymond / Luca Sanchez | |
The 2025 Olbia Challenger was a professional tennis tournament played on hardcourts. It was the third edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Olbia, Italy between 13 and 19 October 2025.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 CHI | Alejandro Tabilo | 74 | 1 |
 CZE | Vít Kopřiva | 93 | 2 |
 ESP | Martín Landaluce | 111 | 3 |
 USA | Nishesh Basavareddy | 113 | 4 |
| ESP | Roberto Carballés Baena | 116 | 5 |
| ESP | Pablo Carreño Busta | 123 | 6 |
 SRB | Dušan Lajović | 126 | 7 |
 TUN | Moez Echargui | 145 | 8 |
The following players received wildcards into the singles main draw:
Pierluigi Basile Carlo Alberto Caniato Francesco Forti 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:
Lorenzo Carboni
Daniil Glinka 
Norbert Gombos Tom Paris Michele Ribecai Clément Tabur The following player received entry as a lucky loser:
Luca Van Assche def. Pablo Carreño Busta 7–6(7–5), 6–7(1–7), 6–2. Arthur Reymond / Luca Sanchez def. 
Victor Vlad Cornea / Bruno Pujol Navarro 6–4, 6–1.