| Date: | 6–12 November 2023 |
| Edition: | 4th (men) 2nd (women) |
| Surface: | Hard / Indoor |
| Location: | Calgary, Canada |
| Category: | ATP Challenger Tour ITF Women's World Tennis Tour |
| Champms: |  Liam Draxl |
| Champmd: | Juan Carlos Aguilar / Justin Boulais |
| Champws: | Sabine Lisicki |
| Champwd: |  Sarah Beth Grey / Eden Silva |
| Main Name: | Calgary Challenger |
The 2023 Calgary National Bank Challenger was a professional tennis tournament played on indoor hard courts. It was the fourth edition of the tournament which was part of the 2023 ATP Challenger Tour and the second edition of the tournament which was part of the 2023 ITF Women's World Tennis Tour. It took place in Calgary, Canada between 6 and 12 November 2023.
See main article: 2023 Calgary National Bank Challenger – Men's singles.
Liam Draxl def. Dominik Koepfer 6–4, 6–3.See main article: 2023 Calgary National Bank Challenger – Women's singles.
Stacey Fung 7–6(7–2), 6–7(5–7), 6–3.See main article: 2023 Calgary National Bank Challenger – Men's doubles.
Juan Carlos Aguilar / Justin Boulais def. Charles Broom / Ben Jones 6–3, 6–2.See main article: 2023 Calgary National Bank Challenger – Women's doubles.
Sarah Beth Grey / Eden Silva def. 
Hanna Chang / 
Katarina Jokić, 6–4, 6–4| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Dominik Koepfer | 75 | 1 | ||
 Australia | James Duckworth | 111 | 2 | |
 France | Benoît Paire | 126 | 3 | |
| Canada | Gabriel Diallo | 136 | 4 | |
| United Kingdom | Ryan Peniston | 181 | 5 | |
 Belgium | Zizou Bergs | 184 | 6 | |
| Belgium | Kimmer Coppejans | 190 | 7 | |
 Tunisia | Aziz Dougaz | 232 | 8 |
The following players received wildcards into the singles main draw:
Justin Boulais Liam Draxl Dan MartinThe following players received entry from the qualifying draw:
Juan Carlos Aguilar Patrick Brady
Iñaki Montes de la Torre
Kiranpal Pannu Ryan Seggerman Enzo Wallart| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Canada | Katherine Sebov | 141 | 1 | |
| Australia | Arina Rodionova | 148 | 2 | |
| Lulu Sun | 223 | 3 | ||
| Lesley Pattinama Kerkhove | 234 | 4 | ||
| Canada | Stacey Fung | 250 | 5 | |
 Lithuania | Justina Mikulskytė | 271 | 6 | |
| United States | Jamie Loeb | 285 | 7 | |
| United States | Liv Hovde | 291 | 8 |
The following players received wildcards into the singles main draw:
Kayla Cross Alexia Jacobs Martyna Ostrzygalo Layne SleethThe following players received entry from the qualifying draw:
Isabelle Boulais Katarina Jokić Kylie McKenzie
Martina Okáľová Caroline Roméo Allura Zamarripa Amy ZhuThe following player received entry as a lucky loser:
