| Date: | 10–16 September |
| Edition: | 16th |
| Category: | ITF Women's Circuit |
| Location: | Biarritz, France |
| Prize Money: | $80,000 |
| Champs: | Tamara Korpatsch |
| Champd: |  Irina Bara /  Valentyna Ivakhnenko |
| Main Name: | Open de Biarritz |
The 2018 Open de Biarritz was the 16th edition of the Open de Biarritz, a professional tennis tournament played on outdoor clay courts. This edition of the tournament was part of the 2018 ITF Women's Circuit. It took place in Biarritz, France, on 10–16 September 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Carina Witthöft | 101 | 1 | ||
 Uzbekistan | Sabina Sharipova | 123 | 2 | |
 Belgium | Ysaline Bonaventure | 124 | 3 | |
 Ukraine | Anhelina Kalinina | 134 | 4 | |
| Romania | Irina Bara | 139 | 5 | |
| Laura Siegemund | 146 | 6 | ||
| Conny Perrin | 148 | 7 | ||
| Russian Federation | Irina Khromacheva | 149 | 8 |
The following players received a wildcard into the singles main draw:
The following player received entry using a protected ranking:
The following players received entry by special exempts:
The following players received entry from the qualifying draw:
See main article: 2018 Engie Open de Biarritz – Singles.
See main article: 2018 Engie Open de Biarritz – Doubles.
Irina Bara / Valentyna Ivakhnenko def. Ysaline Bonaventure / Hélène Scholsen, 6–4, 6–1
