| Doubles | |
|---|---|
| 2017 Barcelona Open Banco Sabadell | |
| Champions |  Florin Mergea  Aisam-ul-Haq Qureshi |
| Runners-up |  Philipp Petzschner  Alexander Peya |
| Score | 6–4, 6–3 |
Bob and Mike Bryan were the defending champions, but chose not to participate this year.
Florin Mergea and Aisam-ul-Haq Qureshi won the title, defeating Philipp Petzschner and Alexander Peya in the final, 6–4, 6–3.
Henri Kontinen / 
John Peers (quarterfinals)
Jamie Murray / 
Bruno Soares (first round)
Ivan Dodig / 
Marcel Granollers (first round) Feliciano López / Marc López (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | H Kontinen J Peers | 77 | 77 | ||||||||||||||||||||||||
 R Bopanna  P Cuevas | 63 | 62 | 1 | H Kontinen J Peers | 4 | 4 | |||||||||||||||||||||
| Q |  M Daniell M Demoliner | 4 | 4 | F Mergea A-u-H Qureshi | 6 | 6 | |||||||||||||||||||||
| F Mergea A-u-H Qureshi | 6 | 6 | F Mergea A-u-H Qureshi | 6 | 5 | [14] | |||||||||||||||||||||
| 4 | F López M López | 7 | 4 | [6] |  J-J Rojer H Tecău | 3 | 7 | [12] | |||||||||||||||||||
 Ł Kubot M Zverev | 5 | 6 | [10] | Ł Kubot M Zverev | 3 | 4 | |||||||||||||||||||||
| WC | J Munar A Ramos Viñolas | 4 | 2 | J-J Rojer H Tecău | 6 | 6 | |||||||||||||||||||||
| J-J Rojer H Tecău | 6 | 6 | F Mergea A-u-H Qureshi | 6 | 6 | ||||||||||||||||||||||
| PR | P Petzschner A Peya | 6 | 6 | PR | P Petzschner A Peya | 4 | 3 | ||||||||||||||||||||
 K Khachanov D Thiem | 3 | 3 | PR | P Petzschner A Peya | 6 | 4 | [10] | ||||||||||||||||||||
 D Goffin  P-H Herbert | 3 | 77 | [10] | D Goffin P-H Herbert | 3 | 6 | [7] | ||||||||||||||||||||
| 3 | I Dodig M Granollers | 6 | 62 | [7] | PR | P Petzschner A Peya | 6 | 6 | |||||||||||||||||||
| WC | P Carreño Busta JC Ferrero | 2 | 7 | [7] | F Martin É Roger-Vasselin | 1 | 1 | ||||||||||||||||||||
M Matkowski  D Nestor | 6 | 5 | [10] | M Matkowski D Nestor | 3 | 64 | |||||||||||||||||||||
| F Martin É Roger-Vasselin | 77 | 2 | [10] | F Martin É Roger-Vasselin | 6 | 77 | |||||||||||||||||||||
| 2 | J Murray B Soares | 65 | 6 | [3] | |||||||||||||||||||||||
Marcus Daniell / Marcelo Demoliner (qualified) Purav Raja / Divij Sharan (first round)| First round | Qualifying competition | ||||||||||||
| 1 | Marcus Daniell Marcelo Demoliner | 77 | 6 | ||||||||||
| WC | Roberto Carballés Baena Íñigo Cervantes | 63 | 4 | ||||||||||
| 1 | Marcus Daniell Marcelo Demoliner | 3 | 7 | [10] | |||||||||
 Kevin Anderson André Sá | 6 | 5 | [5] | ||||||||||
| Kevin Anderson André Sá | 6 | 6 | |||||||||||
| 2 | Purav Raja Divij Sharan | 4 | 4 | ||||||||||
This was the first edition of the tournament since 2008.
This was the first edition of the tournament since 2008.
Marcus Daniell and Marcelo Demoliner were the defending champions, but played with different partners. Daniell partnered Dennis Novikov while Demoliner played with Aisam-ul-Haq Qureshi. Daniell lost in the first round to Johan Brunström and Andreas Siljeström. Demoliner also failed to defend his title, losing in the final to Wesley Koolhof and Matwé Middelkoop 7–6(7–5), 0–6, [10–8].
Jérémy Chardy and Łukasz Kubot were the defending champions, but they chose to compete in Hamburg instead.
Łukasz Kubot and Édouard Roger-Vasselin were the defending champions, but Kubot chose not to participate this year. Roger-Vasselin played alongside Julien Benneteau, but lost in the first round to Marcus Daniell and Marcelo Demoliner.
Łukasz Kubot and Marcelo Melo were the defending champions and successfully defended their title, defeating Oliver Marach and Fabrice Martin in the final, 4–6, 6–3, [13–11].
Mate Pavić and Michael Venus were the defending champions, but Pavić chose to compete in Sofia instead. Venus played alongside Robert Lindstedt, but lost in the quarterfinals to Alexander and Mischa Zverev.
Julio Peralta and Horacio Zeballos were the defending champions, but lost in the quarterfinals to Facundo Bagnis and Guillermo Durán.
Eric Butorac and Scott Lipsky were the defending champions, but Butorac retired from professional tennis in September 2016 and Lipsky chose to compete in Istanbul instead.
Marcus Daniell and Artem Sitak were the defending champions, but chose not to participate together. Daniell played alongside Marcelo Demoliner, but lost in the quarterfinals to Bob and Mike Bryan. Sitak teamed up with Nicholas Monroe, but lost in the quarterfinals to Oliver Marach and Mate Pavić.
Pierre-Hugues Herbert and Nicolas Mahut were the two-time defending champions, but retired in the first round against Marcus Daniell and Marcelo Demoliner.
Marcel Granollers and David Marrero were the defending champions, but Granollers chose not to participate this year. Marrero played alongside Nenad Zimonjić, but lost in the quarterfinals to Elias and Mikael Ymer.
Julio Peralta and Horacio Zeballos were the defending champions, but chose to compete in Hamburg instead.
Raven Klaasen and Rajeev Ram were the defending champions, but Klaasen chose not to participate this year and Ram chose to compete in Shenzhen instead.
Thanasi Kokkinakis and Jordan Thompson were the defending champions, but Kokkinakis chose to compete in the Hopman Cup instead. Thompson played alongside Lleyton Hewitt, but lost in the first round to Grigor Dimitrov and Ryan Harrison.
Jamie Murray and Bruno Soares were the defending champions, but lost in the final to Henri Kontinen and John Peers, 4–6, 3–6.
Austin Krajicek and Rajeev Ram were the defending champions, but chose to compete in Stockholm and Antwerp, respectively, instead.
Bob and Mike Bryan were the two-time defending champions, but they retired in August 2020 so they did not defend their titles. Ariel Behar and Gonzalo Escobar won the title, defeating Christian and Ryan Harrison in the final, 6–7(5–7), 7–6(7–4), [10–4].
Marcelo Demoliner and Santiago González defeated Ariel Behar and Gonzalo Escobar in the final, 4–6, 6–3, [10–8], to win the doubles tennis title at the 2021 Stuttgart Open. It was their second title as a team, their first in three years. Behar and Escobar were contesting for their third title of the season.
Marcelo Demoliner and Matwé Middelkoop were the reigning champions from when the tournament was last held in 2019, but chose to compete with different partners. Demoliner played alongside Marcus Daniell, but lost in the first round to Ariel Behar and Gonzalo Escobar.