| 2019 OEC Kaohsiung | |
|---|---|
| Date | 16–22 September |
| Edition | 8th |
| Surface | Hard |
| Location | Kaohsiung, Taiwan |
| Champions | |
| Singles | |
 John Millman | |
| Doubles | |
 Hsieh Cheng-peng / Yang Tsung-hua | |
The 2019 OEC Kaohsiung was a professional tennis tournament played on hard courts. It was the eighth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Kaohsiung, Taiwan between 16 and 22 September 2019.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 POL | Kamil Majchrzak | 84 | 1 |
 IND | Prajnesh Gunneswaran | 85 | 2 |
| AUS | John Millman | 95 | 3 |
| AUS | |||
 CZE | Jiří Veselý | 131 | 5 |
| TPE | Jason Jung | 132 | 6 |
 JPN | Go Soeda | 134 | 7 |
| JPN | Yūichi Sugita | 141 | 8 |
| AUS | Alex Bolt | 144 | 9 |
| AUS | Marc Polmans | 159 | 10 |
| JPN | Yasutaka Uchiyama | 165 | 11 |
 CAN | Steven Diez | 170 | 12 |
| AUS | Andrew Harris | 197 | 13 |
 ESP | Enrique López Pérez | 218 | 14 |
| JPN | Yosuke Watanuki | 231 | 15 |
| JPN | Hiroki Moriya | 232 | 16 |
The following players received wildcards into the singles main draw:
Ray Ho Hsieh Cheng-peng Hsu Yu-hsiou Lo Chien-hsun Yu Cheng-yu The following player received entry into the singles main draw using a protected ranking:
Miliaan NiestenThe following players received entry from the qualifying draw:
Yusuke Takahashi Jumpei YamasakiThe following players received entry as lucky losers:
Lee Kuan-yi Tsai Chang-lin John Millman def. Marc Polmans 6–4, 6–2. Hsieh Cheng-peng / Yang Tsung-hua def. 
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