2023 Calgary National Bank 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.

Men's singles

 * 🇨🇦 Liam Draxl def. 🇩🇪 Dominik Koepfer 6–4, 6–3.

Women's singles

 * 🇩🇪 Sabine Lisicki def. 🇨🇦 Stacey Fung 7–6(7–2), 6–7(5–7), 6–3.

Men's doubles

 * 🇨🇦 Juan Carlos Aguilar / 🇨🇦 Justin Boulais def. 🇬🇧 Charles Broom / 🇬🇧 Ben Jones 6–3, 6–2.

Women's doubles

 * 🇬🇧 Sarah Beth Grey / 🇬🇧 Eden Silva def. 🇺🇸 Hanna Chang / 🇷🇸 Katarina Jokić, 6–4, 6–4

Seeds

 * 1 Rankings are as of 30 October 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇨🇦 Justin Boulais
 * 🇨🇦 Liam Draxl
 * 🇨🇦 Dan Martin

The following players received entry from the qualifying draw:
 * 🇨🇦 Juan Carlos Aguilar
 * 🇬🇧 Patrick Brady
 * 🇪🇸 Iñaki Montes de la Torre
 * 🇳🇿 Kiranpal Pannu
 * 🇺🇸 Ryan Seggerman
 * 🇫🇷 Enzo Wallart

Seeds

 * 1 Rankings are as of 23 October 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇨🇦 Kayla Cross
 * 🇨🇦 Alexia Jacobs
 * 🇨🇦 Martyna Ostrzygalo
 * 🇨🇦 Layne Sleeth

The following players received entry from the qualifying draw:
 * 🇨🇦 Isabelle Boulais
 * 🇷🇸 Katarina Jokić
 * 🇺🇸 Kylie McKenzie
 * 🇸🇰 Martina Okáľová
 * Kira Pavlova
 * 🇫🇷 Caroline Roméo
 * 🇺🇸 Allura Zamarripa
 * 🇺🇸 Amy Zhu

The following player received entry as a lucky loser:
 * 🇯🇵 Nagi Hanatani