| 2025 Seoul Open Challenger | |
|---|---|
| Date | 27 October – 2 November |
| Edition | 9th |
| Surface | Hard |
| Location | Seoul, South Korea |
| 2024 Champions | |
| Singles | |
 Nikoloz Basilashvili | |
| Doubles | |
 Saketh Myneni / Ramkumar Ramanathan | |
The 2025 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the ninth edition of the tournament. It was part of the 2025 ATP Challenger Tour. It took place in Seoul, South Korea, between 27 October and 2 November 2025.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 AUS | James Duckworth | 108 | 1 |
 CHN | Bu Yunchaokete | 115 | 2 |
 JPN | Yoshihito Nishioka | 152 | 3 |
 AUT | Jurij Rodionov | 154 | 4 |
 HKG | Coleman Wong | 156 | 5 |
 POR | Henrique Rocha | 161 | 6 |
| JPN | Yosuke Watanuki | 167 | 7 |
| JPN | Taro Daniel | 179 | 8 |
The following players received wildcards into the singles main draw:
Chung Hyeon Shin San-hui Shin Woo-binThe following players received entry from the qualifying draw:
Masamichi Imamura Kokoro Isomura Yuki Mochizuki Park Ui-sung 
Kasidit Samrej Philip Sekulic 
vs. 
