Xavier Malisse and Olivier Rochus were the defending champions, but lost in the third round against third seeds and eventual finalists Bob & Mike Bryan.
Jonas Björkman and Todd Woodbridge were the two-time defending champions but did not play together. Björkman partnered with Max Mirnyi and Woodbridge partnered with Mahesh Bhupathi but both pairs lost to Stephen Huss and Wesley Moodie, in the semifinals and the second round respectively.
Michaël Llodra and Fabrice Santoro were the defending champions, but they lost in quarterfinals 6–7(2), 5–7, against Jonas Björkman and Max Mirnyi.
Bob and Mike Bryan were the defending champions, they lost to sixth-seeded Michaël Llodra and Fabrice Santoro in the semifinals.
Paul Haarhuis and Yevgeny Kafelnikov were defending champions, but they lost in the final to third seeds Bob and Mike Bryan, who won the first Grand Slam title of their careers.
The 2003 Canada Masters doubles was the men's doubles event of the one hundred and fourteenth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada. Bob Bryan and Mike Bryan were the defending champions but lost in the semifinals to Jonas Björkman and Todd Woodbridge. Mahesh Bhupathi and Max Mirnyi won in the final 6–3, 7–6(7–4) against Björkman and Woodbridge.
Jonas Björkman and Todd Woodbridge successfully defended their title, defeating Mahesh Bhupathi and Max Mirnyi in the final, 3–6, 6–3, 7–6(7–4), 6–3, to win the gentlemen's doubles title at the 2003 Wimbledon Championships
Jonas Björkman and Todd Woodbridge were the defending champions but lost in the final 6–2, 6–4 against Mahesh Bhupathi and Jan-Michael Gambill.
James Blake and Todd Martin were the defending champions but lost in the second round to Wayne Arthurs and Paul Hanley.
Nicolas Escudé and Fabrice Santoro were the defending champions but only Santoro competed that year with Michaël Llodra.
Roger Federer and Max Mirnyi were the defending champions but only Mirnyi competed that year with Mahesh Bhupathi.
Wayne Arthurs and Paul Hanley were the defending champions, but lost in the first round this year.
Arnaud Clément and Sébastien Grosjean were the defending champions, but did not partner together this year. Clément partnered Jaroslav Levinský, losing in the first round. Grosjean partnered Gaël Monfils, losing in the second round.
Wayne Black and Kevin Ullyett were the defending champions, but lost in the final this year..
Mahesh Bhupathi and Max Mirnyi were the defending champions, but lost in the quarterfinals to Michaël Llodra and Fabrice Santoro.
Bob and Mike Bryan were the defending champions, but lost in second round to Jonathan Erlich and Andy Ram.
Mark Knowles and Daniel Nestor were the defending champions, but lost in Quarterfinals to Wayne Black and Kevin Ullyett.
Wayne Black and Kevin Ullyett were the defending champions, but lost in second round to Mario Ančić and Ivan Ljubičić.
Mahesh Bhupathi and Max Mirnyi were the defending champions, but played this tournament with different partners. Bhupathi teamed up with Todd Woodbridge while Mirnyi teamed up with Jonas Björkman. Both pairs were eliminated in semifinals.
Mahesh Bhupathi and Max Mirnyi defeated defending champions Wayne Arthurs and Paul Hanley 2–6, 6–3, 6–4 in the final. It was the 34th title for Bhupathi and the 20th title for Mirnyi in their respective careers.
Jonas Björkman 
Todd Woodbridge 
Bob Bryan 
