| Date: | 29 April – 5 May |
| Edition: | 5th |
| Location: | Seoul, South Korea |
| Champs: |  Kwon Soon-woo |
| Champd: |  Max Purcell / Luke Saville |
| After Year: | 2022 |
The 2019 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the fifth edition of the tournament. It was part of the 2019 ATP Challenger Tour. It took place in Seoul, South Korea, between 29 April and 5 May 2019.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | ||||
 Lithuania | Ričardas Berankis | 100 | 2 | |
 Ukraine | Sergiy Stakhovsky | 115 | 3 | |
 Canada | Brayden Schnur | 116 | 4 | |
 Slovakia | Lukáš Lacko | 125 | 5 | |
| Jason Jung | 134 | 6 | ||
 Cyprus | Marcos Baghdatis | 137 | 7 | |
 Russian Federation | Evgeny Donskoy | 138 | 8 | |
| Australia | Alex Bolt | 140 | 9 | |
 India | Ramkumar Ramanathan | 151 | 10 | |
| Korea, Republic of | Kwon Soon-woo | 152 | 11 | |
 Japan | Tatsuma Ito | 153 | 12 | |
 Serbia | Nikola Milojević | 156 | 13 | |
 Belgium | Ruben Bemelmans | 166 | 14 | |
| Japan | Hiroki Moriya | 184 | 15 | |
| Japan | Yūichi Sugita | 185 | 16 |
The following players received wildcards into the singles main draw:
Chung Hong Hong Seong-chan Kim Dong-ju Lee Jea-moon Shin San-huiThe following players received entry into the singles main draw using their ITF World Tennis Ranking:
Bai Yan
Moez Echargui
Youssef Hossam Shintaro Imai Rio NoguchiThe following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
Jacob Grills Nam Ji-sungThe following player received entry as a lucky loser:
Xia ZihaoSee main article: 2019 Seoul Open Challenger – Singles.
Kwon Soon-woo def. Max Purcell 7–5, 7–5.See main article: 2019 Seoul Open Challenger – Doubles.
Max Purcell / Luke Saville def. Ruben Bemelmans / Sergiy Stakhovsky 6–4, 7–6(9–7).