| Date: | 26 October – 1 November |
| Edition: | 2nd |
| Surface: | Hard (indoor) |
| Location: | Hamburg, Germany |
| Champs: |  Taro Daniel |
| Champd: | Marc-Andrea Hüsler /  Kamil Majchrzak |
| After Year: | 2022 |
| After Name: | Hamburg Ladies & Gents Cup |
The 2020 Tennis Challenger Hamburg was a professional tennis tournament played on indoor hard courts. It was the second edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Hamburg, Germany between 26 October and 1 November 2020.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Poland | Kamil Majchrzak | 105 | 1 | |
| Japan | Taro Daniel | 121 | 2 | |
| J. J. Wolf | 122 | 3 | ||
| Daniel Altmaier | 124 | 4 | ||
 India | Sumit Nagal | 130 | 5 | |
| Henri Laaksonen | 132 | 6 | ||
 Serbia | Nikola Milojević | 135 | 7 | |
| Oscar Otte | 141 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
The following players received entry into the singles main draw as special exempts:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
See main article: 2020 Tennis Challenger Hamburg – Singles.
Taro Daniel def. 
Sebastian Ofner 6–1, 6–2.See main article: 2020 Tennis Challenger Hamburg – Doubles.
Kamil Majchrzak def. 
Lloyd Glasspool / 
Alex Lawson 6–3, 1–6, [20–18].
