| Date: | 17–23 February |
| Edition: | 4th |
| Surface: | Hard (indoor) |
| Location: | Koblenz, Germany |
| Champs: |  Tomáš Macháč |
| Champd: | Sander Arends / David Pel |
| After Year: | 2023 |
The 2020 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the fourth edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Koblenz, Germany from 17 to 23 February 2020.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Yannick Maden | 143 | 1 | ||
| Yannick Hanfmann | 151 | 2 | ||
| Tallon Griekspoor | 172 | 3 | ||
| Oscar Otte | 177 | 4 | ||
 France | Maxime Janvier | 179 | 5 | |
| Botic van de Zandschulp | 201 | 6 | ||
| France | Quentin Halys | 203 | 7 | |
| Mats Moraing | 225 | 8 | ||
| Julian Lenz | 241 | 9 | ||
| Dustin Brown | 242 | 10 | ||
 Spain | Nicola Kuhn | 246 | 11 | |
 Belgium | Ruben Bemelmans | 251 | 12 | |
| Daniel Masur | 253 | 13 | ||
 Russian Federation | Teymuraz Gabashvili | 270 | 14 | |
 Austria | Lucas Miedler | 277 | 15 | |
| Russian Federation | Pavel Kotov | 282 | 16 |
The following players received wildcards into the singles main draw:
Marek GengelThe following players received entry from the qualifying draw:
Sasikumar MukundThe following player received entry as a lucky loser:
See main article: 2020 Koblenz Open – Singles.
Tomáš Macháč def. Botic van de Zandschulp 6–3, 4–6, 6–3.See main article: 2020 Koblenz Open – Doubles.
