| Date: | 24 – 30 April |
| Edition: | 7th |
| Location: | Seoul, South Korea |
| Champs: |  Bu Yunchaokete |
| Champd: |  Max Purcell /  Yasutaka Uchiyama |
The 2023 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the seventh edition of the tournament. It was part of the 2023 ATP Challenger Tour. It took place in Seoul, South Korea, between 24 and 30 April 2023.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | Max Purcell | 88 | 1 | |
 United States | Christopher Eubanks | 90 | 2 | |
| Australia | Jordan Thompson | 91 | 3 | |
| Australia | James Duckworth | 113 | 4 | |
 Ecuador | Emilio Gómez | 120 | 5 | |
| Australia | Rinky Hijikata | 138 | 6 | |
| Australia | Aleksandar Vukic | 140 | 7 | |
| United States | Denis Kudla | 145 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
See main article: 2023 Seoul Open Challenger – Singles.
Bu Yunchaokete def. Aleksandar Vukic 7–6(7–4), 6–4.See main article: 2023 Seoul Open Challenger – Doubles.
Max Purcell / Yasutaka Uchiyama def. 
Chung Yun-seong / Yuta Shimizu 6–1, 6–4.