| Date: | 7–13 September |
| Edition: | 13th |
| Category: | ITF Women's Circuit |
| Location: | Biarritz, France |
| Prize Money: | $100,000 |
| Champs: | Laura Siegemund |
| Champd: |  Başak Eraydın /  Lidziya Marozava |
| Before Name: | Open GDF Suez de Biarritz |
The 2015 Engie Open de Biarritz was a professional tennis tournament played on outdoor clay courts. It was the thirteenth edition of the tournament and part of the 2015 ITF Women's Circuit, offering a total of $100,000 in prize money. It took place in Biarritz, France, on 7–13 September 2015.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Romania | Alexandra Dulgheru | 52 | 1 | |
 Brazil | Teliana Pereira | 54 | 2 | |
 Estonia | Kaia Kanepi | 89 | 3 | |
 Spain | Lourdes Domínguez Lino | 105 | 4 | |
 Czech Republic | Klára Koukalová | 109 | 5 | |
| Laura Siegemund | 126 | 6 | ||
| Romina Oprandi | 127 | 7 | ||
 France | Océane Dodin | 128 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Tatiana Búa Başak Eraydın Cristina Sánchez QuintanarThe following players received entry by a lucky loser spot:
See main article: 2015 Engie Open de Biarritz – Singles.
See main article: 2015 Engie Open de Biarritz – Doubles.
Başak Eraydın / Lidziya Marozava def. 
Réka-Luca Jani / 
Stephanie Vogt, 6–4, 6–4