| Date: | July 20–26 |
| Edition: | 22nd (men) 5th (women) |
| Category: | ATP Challenger Tour ITF Women's Circuit |
| Prize Money: | (men) (women) |
| Surface: | Hard – outdoors |
| Location: | Granby, Quebec, Canada |
| Venue: | Club de tennis des Loisirs de Granby |
| Champms: |  Vincent Millot |
| Champws: |  Johanna Konta |
| Champmd: |  Philip Bester / Peter Polansky |
| Champwd: |  Jessica Moore / Storm Sanders |
| Main Name: | Challenger de Granby |
The 2015 Challenger Banque Nationale de Granby was a professional tennis tournament played on outdoor hard courts. It was the 22nd edition, for men, and 5th edition, for women, of the tournament and part of the 2015 ATP Challenger Tour and the 2015 ITF Women's Circuit, offering totals of $100,000, for men, and $50,000, for women, in prize money. It took place in Granby, Quebec, Canada between July 20 and July 26, 2015.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Benjamin Becker | 54 | 1 | ||
 Slovakia | Lukáš Lacko | 93 | 2 | |
 Japan | Go Soeda | 108 | 3 | |
| Japan | Yoshihito Nishioka | 143 | 4 | |
| Australia | ||||
 Belgium | Maxime Authom | 172 | 6 | |
 Italy | Matteo Donati | 183 | 7 | |
| Darian King | 196 | 8 |
The following players received wildcards into the singles main draw:
Isade Juneau Pavel Krainik Brayden Schnur Denis ShapovalovThe following player entered the singles main draw with a protected ranking:
Dennis NevoloThe following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Jean-Yves Aubone| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| United Kingdom | Johanna Konta | 127 | 1 | |
| Japan | Naomi Osaka | 159 | 2 | |
| France | Stéphanie Foretz | 171 | 3 | |
| France | Julie Coin | 187 | 4 | |
 Mexico | Marcela Zacarías | 214 | 5 | |
| Australia | Olivia Rogowska | 224 | 6 | |
| United Kingdom | Naomi Broady | 225 | 7 | |
| France | Amandine Hesse | 229 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Allie Halbauer Akari Inoue Maria Patrascu Katherine SebovSee main article: 2015 Challenger Banque Nationale de Granby – Men's singles.
Vincent Millot def. Philip Bester, 6–4, 6–4See main article: 2015 Challenger Banque Nationale de Granby – Women's singles.
Johanna Konta def. Stéphanie Foretz, 6–2, 6–4See main article: 2015 Challenger Banque Nationale de Granby – Men's doubles.
Philip Bester / Peter Polansky def. Enzo Couacaud / Luke Saville, 6–7(5–7), 7–6(7–2), [10–7]See main article: 2015 Challenger Banque Nationale de Granby – Women's doubles.
Jessica Moore / Storm Sanders def. Laura Robson / Erin Routliffe, 7–5, 6–2