| Date: | 12–18 January |
| Edition: | 12th |
| Surface: | Hard |
| Location: | Bangkok, Thailand |
| Champs: |  Attila Balázs |
| Champd: |  Andrey Golubev / Aleksandr Nedovyesov |
The 2020 Bangkok Challenger was a professional tennis tournament played on hard courts. It was the twelfth edition of the tournament and was part of the 2020 ATP Challenger Tour. It took place in Bangkok, Thailand between 12 and 18 January 2020.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Czech Republic | Jiří Veselý | 102 | 1 | |
| Hungary | Attila Balázs | 131 | 2 | |
| Robin Haase | 161 | 3 | ||
 Uzbekistan | Denis Istomin | 174 | 4 | |
 Tunisia | Malek Jaziri | 229 | 5 | |
 Russian Federation | Roman Safiullin | 248 | 6 | |
 Ukraine | Illya Marchenko | 251 | 7 | |
| Russian Federation | Evgeny Karlovskiy | 252 | 8 | |
 Italy | Gian Marco Moroni | 255 | 9 | |
 Argentina | Renzo Olivo | 263 | 10 | |
| Russian Federation | ||||
| Gonçalo Oliveira | 271 | 12 | ||
 Colombia | Santiago Giraldo | 272 | 13 | |
| JC Aragone | 274 | 14 | ||
| Borna Gojo | 275 | 15 | ||
| Daniel Altmaier | 276 | 16 |
The following players received wildcards into the singles main draw:
Congsup Congcar Palaphoom Kovapitukted Michael Mathayomchand Kasidit Samrej Wishaya TrongcharoenchaikulThe following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
Vladyslav Orlov
Sidharth RawatThe following player received entry into the singles main draw as a lucky loser:
See main article: 2020 Bangkok Challenger – Singles.
Attila Balázs def. Aslan Karatsev 7–6(7–5), 0–6, 7–6(8–6).See main article: 2020 Bangkok Challenger – Doubles.
Andrey Golubev / Aleksandr Nedovyesov def. Sanchai Ratiwatana / Christopher Rungkat 3–6, 7–6(7–1), [10–5].
