| Date: | 5–11 August |
| Edition: | 1st |
| Location: | Yokkaichi, Japan |
| Champs: |  Yūichi Sugita |
| Champd: |  Nam Ji-sung / Song Min-kyu |
| After Year: | 2022 |
The 2019 Yokkaichi Challenger was a professional tennis tournament played on hard courts. It was the 1st edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Yokkaichi, Japan between 5 and 11 August 2019.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Japan | Yasutaka Uchiyama | 139 | 1 | |
 Australia | James Duckworth | 141 | 2 | |
| Japan | Tatsuma Ito | 154 | 3 | |
| Korea, Republic of | Chung Hyeon | 166 | 4 | |
| Japan | Yūichi Sugita | 197 | 5 | |
 China | Zhang Ze | 215 | 6 | |
| Japan | Hiroki Moriya | 216 | 7 | |
| Korea, Republic of | Chung Yun-seong | 237 | 8 | |
 India | Saketh Myneni | 264 | 9 | |
| Wu Tung-lin | 282 | 10 | ||
| Korea, Republic of | Nam Ji-sung | 292 | 11 | |
| Yang Tsung-hua | 300 | 12 | ||
| Japan | Makoto Ochi | 378 | 13 | |
| Japan | Yusuke Takahashi | 389 | 14 | |
| Japan | Renta Tokuda | 397 | 15 | |
| Lý Hoàng Nam | 400 | 16 |
The following players received wildcards into the singles main draw:
Yasunori Hashikawa Shinji Hazawa Yuya ItoThe following players received entry into the singles main draw as alternates:
The following players received entry into the singles main draw using their ITF World Tennis Ranking:
Yuki Mochizuki Sho Shimabukuro Kento Takeuchi Jumpei YamasakiSee main article: 2019 Yokkaichi Challenger – Singles.
Yūichi Sugita def. James Duckworth 3–6, 6–3, 7–6(7–1).See main article: 2019 Yokkaichi Challenger – Doubles.
Nam Ji-sung / Song Min-kyu def. Gong Maoxin / Zhang Ze 6–3, 3–6, [14–12].