The 2018 Coupe Banque Nationale is a women's tennis tournament played on indoor carpet courts.

It was the 26th edition of the Tournoi de Québec and part of the WTA International tournaments of the 2018 WTA Tour.

It took place at the PEPS de l'Université Laval in Quebec City, Canada, from September 10 through September 16, 2018.

Eighth-seeded Pauline Parmentier won the singles title.

Pauline Parmentier defeated Jessica Pegula 7–5, 6–2 Asia Muhammad / Maria Sanchez defeated Darija Jurak / Xenia Knoll 6–4, 6–3 ^* Qualifiers prize money is also the round of 32 prize money The following players received wildcards into the singles main draw: The following player entered the singles main draw with a protected ranking: The following players received entry from the qualifying draw: The following pairs received wildcards into the doubles main draw: