| Doubles | |
|---|---|
| 2017 Engie Open Andrézieux-Bouthéon 42 | |
| Champions |  Nicola Geuer Anna Zaja |
| Runners-up |  Ana Bogdan Ioana Loredana Roșca |
| Score | 6–3, 2–2 ret. |
Elise Mertens and An-Sophie Mestach were the defending champions, but both players chose not to participate.
Nicola Geuer and Anna Zaja won the title when Ana Bogdan and Ioana Loredana Roșca retired in the final at 6–3, 2–2.
Xenia Knoll / 
Lenka Kunčíková (semifinals)
Anna Kalinskaya / 
Lidziya Marozava (semifinals) Ilona Kremen / 
Prarthana Thombare (first round) Nicola Geuer / Anna Zaja (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | X Knoll L Kunčíková | 4 | 6 | [11] | |||||||||||||||||||||||
 C Rosatello  K von Deichmann | 6 | 1 | [9] | 1 | X Knoll L Kunčíková | 6 | 63 | [10] | |||||||||||||||||||
 D Marcinkēviča  E Wacanno | 1 | 5 | WC |  L Robson B Schoofs | 4 | 77 | [4] | ||||||||||||||||||||
| WC | L Robson B Schoofs | 6 | 7 | 1 | X Knoll L Kunčíková | 2 | 4 | ||||||||||||||||||||
| 3 | I Kremen P Thombare | 3 | 4 | WC | A Bogdan IL Roșca | 6 | 6 | ||||||||||||||||||||
| WC | A Bogdan IL Roșca | 6 | 6 | WC | A Bogdan IL Roșca | 6 | 63 | [10] | |||||||||||||||||||
 C Paquet  R Šramková | 78 | 6 | C Paquet R Šramková | 2 | 77 | [7] | |||||||||||||||||||||
| WC | M Armitano  C Bucșa | 66 | 2 | WC | A Bogdan IL Roșca | 3 | 2r | ||||||||||||||||||||
A Gabueva  S Shapatava | 1 | 2 | 4 | N Geuer A Zaja | 6 | 2 | |||||||||||||||||||||
Q Lemoine  C Lister | 6 | 6 | Q Lemoine C Lister | 4 | 2 | ||||||||||||||||||||||
| M Hončová S Reix | 3 | 3 | 4 | N Geuer A Zaja | 6 | 6 | |||||||||||||||||||||
| 4 | N Geuer A Zaja | 6 | 6 | 4 | N Geuer A Zaja | 6 | 7 | ||||||||||||||||||||
 A Amanmuradova E Gorgodze | 6 | 713 | 2 | A Kalinskaya L Marozava | 3 | 5 | |||||||||||||||||||||
| M Arcangioli A Sadiković | 3 | 611 | A Amanmuradova E Gorgodze | 3 | 4 | ||||||||||||||||||||||
 E Bektas R Yurovsky | 4 | 7 | [6] | 2 | A Kalinskaya L Marozava | 6 | 6 | ||||||||||||||||||||
| 2 | A Kalinskaya L Marozava | 6 | 5 | [10] | |||||||||||||||||||||||
Mariana Duque and Julia Glushko were the defending champions, but both players chose not to participate.
Nicola Geuer and Viktorija Golubic were the defending champions, but Golubic chose to participate at the 2016 Ricoh Open instead. Geuer partnered Anna Zaja, but withdrew prior to their semifinal match.
Kristína Kučová and Anastasija Sevastova were the defending champions, but chose not to participate.
Mihaela Buzărnescu and Justyna Jegiołka were the defending champions, but Jegiołka decided not to participate this year.
Andreea Mitu and Monica Niculescu were the defending champions, but Niculescu chose not to participate. Mitu played alongside Patricia Maria Țig, but lost in the first round to Nao Hibino and Alicja Rosolska.
María Irigoyen and Barbora Krejčíková were the defending champions, but chose not to participate.
Barbora Krejčíková and Mandy Minella were the defending champions, but Krejčíková chose not to participate. Minella partnered Elise Mertens, and successfully defended her title, defeating Anna Smith and Renata Voráčová in the final 6–4, 6–4.
Julia Glushko and Alexandra Panova were the defending champions, but both players chose not to participate.
Nicola Geuer and Anna Zaja were the defending champions, but Zaja chose not to participate. Geuer partnered Eva Wacanno, but they lost in the first round to Amina Anshba and Alina Silich.
Nao Hibino and Alicja Rosolska were the defending champions, but both players chose not to participate.
Peng Shuai was the defending champion, but chose not to participate.
Nicola Geuer and Anna Zaja were the defending champions, but Zaja chose not to participate. Geuer played alongside Cornelia Lister, but lost in the semifinals to Ysaline Bonaventure and Bibiane Schoofs.
Kiki Bertens was the two-time defending champion, but lost in the quarterfinals to Kirsten Flipkens.
Irina-Camelia Begu and Raluca Olaru were the defending champions, but chose not to participate together. Olaru played alongside Mihaela Buzărnescu, but lost in the semifinals to Danka Kovinić and Maryna Zanevska. Begu teamed up with Andreea Mitu and successfully defended the title, defeating Kovinić and Zanevska in the final, 6–3, 6–4.
Tamara Korpatsch was the defending champion, but lost in the semifinals to Laura Siegemund.
Belinda Bencic and Yanina Wickmayer were the defending champions, but both chose not to participate.
Anna Karolína Schmiedlová was the defending champion, but lost in the second round to Beatriz Haddad Maia.
Kathinka von Deichmann was the defending champion, but lost to Arantxa Rus in the second round.
Anastasija Sevastova was the defending champion, but lost in the second round to Patricia Maria Țig.
Angelique Kerber defeated Kateřina Siniaková in the final, 6–3, 6–2, to win the singles tennis title at the 2021 Bad Homburg Open. It was Kerber's 13th career WTA Tour singles title, her first in three years.