| Date: | 20–26 January |
| Draw: | 48S / 16D |
| Surface: | Hard |
| Location: | Bangkok, Thailand |
| Champs: |  Federico Gaio |
| Champd: |  Gonzalo Escobar /  Miguel Ángel Reyes-Varela |
The 2020 Bangkok Challenger II was a professional tennis tournament played on hard courts. It was part of the 2020 ATP Challenger Tour. It took place in Bangkok, Thailand between 20 and 26 January 2020.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Czech Republic | Jiří Veselý | 108 | 1 | |
 Japan | Go Soeda | 110 | 2 | |
| Italy | Paolo Lorenzi | 114 | 3 | |
 France | Antoine Hoang | 117 | 4 | |
 Hungary | Attila Balázs | 128 | 5 | |
 China | Zhang Zhizhen | 137 | 6 | |
 Slovakia | Martin Kližan | 142 | 7 | |
| Italy | Federico Gaio | 150 | 8 | |
 Austria | Sebastian Ofner | 156 | 9 | |
| Robin Haase | 161 | 10 | ||
| Italy | Roberto Marcora | 171 | 11 | |
 Uzbekistan | Denis Istomin | 174 | 12 | |
 Canada | Peter Polansky | 180 | 13 | |
 Kazakhstan | Dmitry Popko | 184 | 14 | |
 India | Ramkumar Ramanathan | 185 | 15 | |
| Botic van de Zandschulp | 193 | 16 |
The following players received wildcards into the singles main draw:
Thanapet Chanta Palaphoom Kovapitukted Michael Mathayomchand Kasidit Samrej Wishaya TrongcharoenchaikulThe following player received entry into the singles main draw using a protected ranking:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
See main article: 2020 Bangkok Challenger II – Singles.
Federico Gaio def. Robin Haase 6–1, 4–6, 4–2 ret.See main article: 2020 Bangkok Challenger II – Doubles.
Gonzalo Escobar / Miguel Ángel Reyes-Varela def. Gong Maoxin / Zhang Ze 6–3, 6–3.
