| Doubles | |
|---|---|
| 2023 Sibiu Open | |
| Champions |  Andrew Paulson Michael Vrbenský |
| Runners-up |  Piotr Matuszewski  Kai Wehnelt |
| Score | 6–2, 6–2 |
Ivan and Matej Sabanov were the defending champions [1] but chose not to defend their title.
Andrew Paulson and Michael Vrbenský won the title after defeating Piotr Matuszewski and Kai Wehnelt 6–2, 6–2 in the final.
Piotr Matuszewski / Kai Wehnelt (final)
Niki Kaliyanda Poonacha / Divij Sharan (semifinals)
Zvonimir Babić / 
Alexandru Jecan (quarterfinals) Andrew Paulson / Michael Vrbenský (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | P Matuszewski Kai Wehnelt | 6 | 6 | ||||||||||||||||||||||||
 M Echargui  C Tabur | 3 | 3 | 1 | P Matuszewski K Wehnelt | 6 | 7 | |||||||||||||||||||||
 A Merino Christoph Negritu | 5 | 1 |  S Travaglia A Weis | 4 | 5 | ||||||||||||||||||||||
| S Travaglia Alexander Weis | 7 | 6 | 1 | P Matuszewski K Wehnelt | 77 | 7 | |||||||||||||||||||||
| 3 | Z Babić A Jecan | 6 | 6 | G Blancaneaux C Hemery | 64 | 5 | |||||||||||||||||||||
| WC | Robert Gabriel Ionescu Marc Popescu | 0 | 2 | 3 | Z Babić A Jecan | 2 | 2 | ||||||||||||||||||||
G Ferrari  V Orlov | 3 | 4 | G Blancaneaux C Hemery | 6 | 6 | ||||||||||||||||||||||
| G Blancaneaux C Hemery | 6 | 6 | 1 | P Matuszewski K Wehnelt | 2 | 2 | |||||||||||||||||||||
| Alt |  Denis Klok Ryuki Matsuda | 6 | 6 | 4 | A Paulson M Vrbenský | 6 | 6 | ||||||||||||||||||||
| R Bonadio G Fonio | 3 | 1 | Alt | D Klok R Matsuda | 2 | 3 | |||||||||||||||||||||
 JP Paz Dan Alexandru Tomescu | 0 | 0 | 4 | A Paulson M Vrbenský | 6 | 6 | |||||||||||||||||||||
| 4 | A Paulson M Vrbenský | 6 | 6 | 4 | A Paulson M Vrbenský | 6 | 6 | ||||||||||||||||||||
| 2 | N Kaliyanda Poonacha D Sharan | 2 | 4 | ||||||||||||||||||||||||
| WC |  B Artnak Dragoș Nicolae Cazacu | 7 | 4 | [8] | |||||||||||||||||||||||
| S Caruso A Giannessi | 2 | N Kaliyanda Poonacha D Sharan | 5 | 6 | [10] | ||||||||||||||||||||||
| 2 | N Kaliyanda Poonacha D Sharan | w/o | |||||||||||||||||||||||||
Kenneth Raisma and Stefanos Tsitsipas were the defending champions but both players were no longer eligible to participate in junior events.
Juan Carlos Aguilar and Felipe Meligeni Alves were the defending champions, but both players were ineligible to participate.
Lorenzo Sonego was the defending champion, but chose not to participate. Alex de Minaur defeated Alexander Bublik in the final, 2–0, after Bublik retired with an ankle injury.
Adam Pavlásek was the defending champion but chose not to defend his title.
Marcus Daniell and David Marrero were the defending champions but chose not to defend their title.
Nuno Borges and Francisco Cabral were the defending champions and successfully defended their title, defeating Piotr Matuszewski and David Pichler 6–4, 7–5 in the final.
Alexander Erler and Lucas Miedler were the defending champions but chose not to compete.
Jonáš Forejtek and Michael Vrbenský were the defending champions but chose not to defend their title.
Igor Sijsling and Tim van Rijthoven were the defending champions but chose not to defend their title.
Robert Galloway and Alex Lawson were the defending champions but chose not to defend their title.
Guillermo Durán and Nicolás Mejía were the defending champions but chose not to defend their title.
Nathan Pasha and Max Schnur were the defending champions but only Schnur chose to defend his title, partnering Evan King. Schnur lost in the first round to Arthur Fery and Harold Mayot.
Rafael Matos and Felipe Meligeni Alves were the defending champions but only Meligeni Alves chose to defend his title, partnering Matheus Pucinelli de Almeida. They withdrew before their first round match.
Guillermo Durán and Felipe Meligeni Alves were the defending champions but chose not to defend their title.
Guido Andreozzi and Ignacio Carou were the defending champions but lost in the semifinals to Chung Yun-seong and Christian Langmo.
Alexander Erler and Lucas Miedler were the defending champions but chose not to defend their title.
Luis David Martínez and Andrea Vavassori were the defending champions but chose not to defend their title.
Robin Haase and Sem Verbeek were the defending champions but only Verbeek chose to defend his title, partnering Daniel Cukierman. Verbeek lost in the quarterfinals to Gabriel Roveri Sidney and Akira Santillan.
Alexander Erler and Lucas Miedler were the defending champions but chose not to defend their title.
The 2023 Sibiu Open was a professional tennis tournament played on clay courts. It was the 12th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Sibiu, Romania between 18 and 24 September 2023.
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