| Date: | July 16–22 |
| Edition: | 3rd (men) 5th (women) |
| Category: | ATP Challenger Tour ITF Women's Circuit |
| Surface: | Hard – outdoors |
| Location: | Gatineau, Canada |
| Venue: | Parc de l'Île |
| Champms: |  Bradley Klahn |
| Champws: |  Astra Sharma |
| Champmd: | Robert Galloway / Bradley Klahn |
| Champwd: |  Bianca Andreescu / Carson Branstine |
| Main Name: | Challenger de Gatineau |
The 2018 Challenger Banque Nationale de Gatineau was a professional tennis tournament played on outdoor hard courts. It was the 3rd edition of the tournament for men and the 5th for women, and it was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Gatineau, Canada between July 16 and 22, 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Canada | Peter Polansky | 110 | 1 | |
| Australia | Jason Kubler | 147 | 2 | |
| Darian King | 160 | 3 | ||
 Japan | Tatsuma Ito | 165 | 4 | |
| Bradley Klahn | 168 | 5 | ||
 United Kingdom | Liam Broady | 173 | 6 | |
| Japan | Go Soeda | 178 | 7 | |
| Canada | Filip Peliwo | 181 | 8 |
The following players received wildcards into the singles main draw:
Alexis Galarneau Pavel Krainik Samuel Monette Benjamin SigouinThe following players received entry from the qualifying draw:
Chung Yun-seong Jacob Grills
Edan Leshem
Ricardo Rodríguez| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | Arina Rodionova | 121 | 1 | |
| Australia | Olivia Rogowska | 151 | 2 | |
| Canada | Bianca Andreescu | 184 | 3 | |
| Israel | Julia Glushko | 205 | 4 | |
| Canada | Katherine Sebov | 268 | 5 | |
 Italy | Georgia Brescia | 281 | 6 | |
| Sophie Chang | 288 | 7 | ||
 Mexico | Victoria Rodríguez | 299 | 8 |
The following players received wildcards into the singles main draw:
Bianca Andreescu Ariana Arseneault Layne Sleeth Alexandra VagramovThe following player received entry as a special exempt:
The following players received entry from the qualifying draw:
Alicia Barnett Jodie Anna Burrage Nadja Gilchrist Nagi Hanatani Mai Hontama Raveena Kingsley Catherine Leduc Jada RobinsonThe following player received entry as a lucky loser:
Samantha MurraySee main article: 2018 Challenger Banque Nationale de Gatineau – Men's singles.
Bradley Klahn def. 
Ugo Humbert 6–3, 7–6(7–5). Astra Sharma def. Victoria Rodríguez, 3–6, 6–4, 6–3See main article: 2018 Challenger Banque Nationale de Gatineau – Men's doubles.
Robert Galloway / Bradley Klahn def. Darian King / Peter Polansky 7–6(7–4), 4–6, [10–8]. Bianca Andreescu / Carson Branstine def. Hsu Chieh-yu / Marcela Zacarías, 4–6, 6–2, [10–4]