| Date: | 22–28 October |
| Edition: | 13th |
| Category: | ITF Women's Circuit |
| Location: | Saguenay, Quebec, Canada |
| Surface: | Hard / Indoor |
| Prize Money: | $60,000 |
| Champs: |  Katherine Sebov |
| Champd: |  Tara Moore / Conny Perrin |
| Main Name: | Challenger de Saguenay |
The 2018 Challenger Banque Nationale de Saguenay was a professional tennis tournament played on indoor hard courts. It was the thirteenth edition of the tournament and was part of the 2018 ITF Women's Circuit. It took place in Saguenay, Quebec, Canada, on 22–28 October 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Ukraine | Kateryna Kozlova | 106 | 1 | |
| Conny Perrin | 135 | 2 | ||
| Richèl Hogenkamp | 160 | 3 | ||
| United Kingdom | Naomi Broady | 164 | 4 | |
| Elitsa Kostova | 210 | 5 | ||
 France | Jessika Ponchet | 229 | 6 | |
| Canada | Bianca Andreescu | 242 | 7 | |
 Belgium | Kimberley Zimmermann | 248 | 8 |
The following players received a wildcard into the singles main draw:
Carson Branstine Jada Bui Petra Januskova Alexandra VagramovThe following players received entry from the qualifying draw:
Hayley Carter Jessica Ho Daria Lopatetska Kennedy ShafferSee main article: 2018 Challenger Banque Nationale de Saguenay – Singles.
Katherine Sebov def. Quirine Lemoine, 7–6(12–10), 7–6(7–4)[1]See main article: 2018 Challenger Banque Nationale de Saguenay – Doubles.
Tara Moore / Conny Perrin def. Sharon Fichman / Maria Sanchez, 6–0, 5–7, [10–7]