| Champ: | Marcelo Arévalo Jean-Julien Rojer |
| Runner: |  Rajeev Ram Joe Salisbury |
| Score: | 6–3, 6–1 |
See main article: 2023 National Bank Open.
Marcelo Arévalo and Jean-Julien Rojer defeated Rajeev Ram and Joe Salisbury in the final, 6–3, 6–1 to win the men's doubles tennis title at the 2023 Canadian Open. It was Arévalo's first ATP Tour Masters 1000 title, and Rojer's fourth.[1]
Wesley Koolhof and Neal Skupski were the defending champions,[2] but lost in the second round to Hubert Hurkacz and Mate Pavić.
The top four seeds received a bye into the second round.
The following are the seeded teams. Seedings are based on ATP rankings as of 31 July 2023.
Alejandro Davidovich Fokina / Stefanos Tsitsipas → replaced by 
Peter Polansky / Adil Shamasdin
Rinky Hijikata / Jason Kubler → replaced by Tallon Griekspoor / 
Jiří Lehečka Sebastian Korda / Frances Tiafoe → replaced by 
Sadio Doumbia / Fabien Reboul
India
Poland
Argentina
Mexico