The 2018 Challenger Banque Nationale de Granby was a professional tennis tournament played on outdoor hard courts.

It was the twenty-fifth (ATP) and eighth (ITF) editions of the tournament and was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit.

It took place in Granby, Canada, on 23–29 July 2018.

The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: The following players received entry as lucky losers: The following players received a wildcard into the singles main draw: The following players received entry from the qualifying draw: