| Date: | 24 February–1 March |
| Edition: | 2nd |
| Surface: | Hard (indoor) |
| Location: | Calgary, Canada |
| Champs: |  Arthur Rinderknech |
| Champd: |  Nathan Pasha / Max Schnur |
| Before Year: | 2018 |
| After Year: | 2022 |
The 2020 Calgary National Bank Challenger was a professional tennis tournament played on indoor hard courts. It was the second edition of the tournament and part of the 2020 ATP Challenger Tour. It took place in Calgary, Canada.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Canada | Vasek Pospisil | 98 | 1 | |
 Japan | Go Soeda | 114 | 2 | |
| Ivo Karlović | 123 | 3 | ||
| Japan | Tatsuma Ito | 152 | 4 | |
| Canada | Brayden Schnur | 178 | 5 | |
| United States | Thai-Son Kwiatkowski | 182 | 6 | |
 United Kingdom | Liam Broady | 228 | 7 | |
| France | Arthur Rinderknech | 239 | 8 | |
| Julian Lenz | 245 | 9 | ||
| United States | Maxime Cressy | 252 | 10 | |
| Tobias Kamke | 254 | 11 | ||
 Australia | Akira Santillan | 258 | 12 | |
| United States | JC Aragone | 267 | 13 | |
| France | Geoffrey Blancaneaux | 270 | 14 | |
| Gonçalo Oliveira | 278 | 15 | ||
| France | Manuel Guinard | 300 | 16 |
The following players received wildcards into the singles main draw:
Taha Baadi Gabriel Diallo Alexis Galarneau Cleeve Harper Joshua PeckThe following player received entry into the singles main draw using a protected ranking:
The following players received entry from the qualifying draw:
Felix Corwin Alex RybakovThe following players received entry as lucky losers:
See main article: 2020 Calgary National Bank Challenger – Singles.
Arthur Rinderknech def. Maxime Cressy 3–6, 7–6(7–5), 6–4.See main article: 2020 Calgary National Bank Challenger – Doubles.
Nathan Pasha / Max Schnur def. Harry Bourchier / Filip Peliwo 7–6(7–4), 6–3.