| Doubles | |
|---|---|
| 2025 Oeiras Indoors III | |
| Champions |  Liam Draxl Cleeve Harper |
| Runners-up |  Matwé Middelkoop  Denys Molchanov |
| Score | 1–6, 7–5, [10–6] |
Mili Poljičak and Matej Sabanov were the defending champions [1] but only Sabanov chose to defend his title, partnering Ivan Sabanov. They lost in the quarterfinals to Matwé Middelkoop and Denys Molchanov.
Liam Draxl and Cleeve Harper won the title after defeating Middelkoop and Molchanov 1–6, 7–5, [10–6] in the final.
Matwé Middelkoop / Denys Molchanov (final)
Filip Bergevi / 
Patrik Niklas-Salminen (quarterfinals)
Vasil Kirkov / Bart Stevens (quarterfinals) Patrik Trhac / 
Szymon Walków (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Middelkoop D Molchanov | 6 | 65 | [16] | |||||||||||||||||||||||
| WC |  G Elias Tiago Pereira | 4 | 77 | [14] | 1 | M Middelkoop D Molchanov | 6 | 4 | [10] | ||||||||||||||||||
 A Blockx R Collignon | 0 | 4 |  I Sabanov M Sabanov | 2 | 6 | [4] | |||||||||||||||||||||
| I Sabanov M Sabanov | 6 | 6 | 1 | M Middelkoop D Molchanov | 6 | 6 | |||||||||||||||||||||
| 3 | V Kirkov B Stevens | 6 | 6 |  I Liutarevich M Veldheer | 4 | 4 | |||||||||||||||||||||
 R Albot  D Popko | 4 | 3 | 3 | V Kirkov B Stevens | 3 | 5 | |||||||||||||||||||||
| G Goldhoff T Hilderbrand | 63 | 4 | I Liutarevich M Veldheer | 6 | 7 | ||||||||||||||||||||||
| I Liutarevich M Veldheer | 77 | 6 | 1 | M Middelkoop D Molchanov | 6 | 5 | [6] | ||||||||||||||||||||
 Í Cervantes  LD Martínez | 6 | 712 | L Draxl C Harper | 1 | 7 | [10] | |||||||||||||||||||||
| Alt |  A Merino  C Negritu | 1 | 610 | Í Cervantes LD Martínez | 6 | 6 | |||||||||||||||||||||
| J de Jong A Moro Cañas | 6 | 77 | J de Jong A Moro Cañas | 3 | 4 | ||||||||||||||||||||||
| 4 | P Trhac S Walków | 4 | 64 | Í Cervantes LD Martínez | 4 | 4 | |||||||||||||||||||||
| L Draxl C Harper | 6 | 78 | L Draxl C Harper | 6 | 6 | ||||||||||||||||||||||
| WC | Pedro Araújo M Dodig | 2 | 66 | L Draxl C Harper | 2 | 6 | [10] | ||||||||||||||||||||
 C Chidekh  J Paris | 4 | 6 | [7] | 2 | F Bergevi P Niklas-Salminen | 6 | 3 | [4] | |||||||||||||||||||
| 2 | F Bergevi P Niklas-Salminen | 6 | 3 | [10] | |||||||||||||||||||||||
Denis Istomin and Evgeny Kirillov were the defending champions, but only Kirillov started in this tournament. He teamed up with Sergei Bubka, however they lost to Andis Juška and Deniss Pavlovs in the quarterfinal.
Michail Elgin and Alexandre Kudryavtsev defeated Alexey Kedryuk and Denis Matsukevich 4–6, 6–3, [10–6] in the final.
Radu Albot and Artem Sitak were the defending champion, but they did not participate this year.
Antal van der Duim and Boy Westerhof were the defending champions but chose not to defend their title.
Mate Pavić and Michael Venus were the defending champions, but decided not to defend their title.
Ilija Bozoljac and Igor Zelenay were the defending champions but only Zelenay chose to defend his title, partnering Denys Molchanov. Zelenay lost in the quarterfinals to Ken and Neal Skupski.
Roman Jebavý and Antonio Šančić were the defending champions but only Jebavý chose to defend his title, partnering Florin Mergea. Jebavý lost in the first round to Denys Molchanov and Igor Zelenay.
Oliver Marach and Philipp Oswald were the defending champions, but they chose to compete alongside different partners in Hamburg instead.
Robin Haase and Matwé Middelkoop were the defending champions, but lost to Jeevan Nedunchezhiyan and Purav Raja in the quarterfinals.
Raven Klaasen and Michael Venus were the defending champions, but lost in the first round to Jonathan Eysseric and Gilles Simon.
Tristan Lamasine and Franko Škugor were the defending champions but only Lamasine chose to defend his title, partnering Enzo Couacaud. Lamasine lost in the final to Thiemo de Bakker and Robin Haase.
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Denys Molchanov and Igor Zelenay were the defending champions but chose to defend their title with different partners. Molchanov partnered Hans Podlipnik Castillo but lost in the quarterfinals to Jebavý and Zelenay. Zelenay partnered Roman Jebavý but lost in the final to Frederik Nielsen and Tim Pütz.
Hugo Nys and Tim Pütz were the defending champions but chose not to defend their title.
Jonathan Erlich and Andy Ram were the last defending champions after victory in 2012, but Erlich chose not to participate and Ram retired from professional tennis in 2014.
Nathaniel Lammons and Jackson Withrow were the defending champions but only Withrow chose to defend his title, partnering Denys Molchanov. Withrow lost in the quarterfinals to Andrej Martin and Tristan-Samuel Weissborn.
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Lloyd Glasspool and Harri Heliövaara defeated Rohan Bopanna and Matwé Middelkoop in the final, 6–2, 6–4 to win the men's doubles tennis title at the 2022 Hamburg European Open.
Ivan Dodig and Austin Krajicek defeated Rohan Bopanna and Matthew Ebden in the final, 7–6(7–5), 2–6, [12–10] to win the doubles tennis title at the 2023 Rotterdam Open. The pair saved a championship point en route to the title.
Luca Margaroli and Santiago Rodríguez Taverna were the defending champions but chose not to defend their title.
George Goldhoff and Trey Hilderbrand were the defending champions but lost in the quarterfinals to Cleeve Harper and David Stevenson.