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.
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following players received wildcards into the singles main draw:
The following player received entry as a special exempt:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser: