| Men's doubles | |
|---|---|
| 2019 Challenger Banque Nationale de Gatineau | |
| Champions |  Alex Lawson  Marc Polmans |
| Runners-up |  Hans Hach Verdugo Dennis Novikov |
| Score | 6–4, 3–6, [10–7] |
Robert Galloway and Bradley Klahn were the defending champions but chose not to defend their title. [1]
Alex Lawson and Marc Polmans won the title after defeating Hans Hach Verdugo and Dennis Novikov 6–4, 3–6, [10–7] in the final.
Roberto Maytín / Jackson Withrow (semifinals) Hunter Reese / 
Adil Shamasdin (quarterfinals) Alex Lawson / Marc Polmans (champions) John Paul Fruttero / 
Ruben Gonzales (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | R Maytín J Withrow | 77 | 6 | ||||||||||||||||||||||||
 D King P Polansky | 64 | 2 | 1 | R Maytín J Withrow | 6 | 1 | [10] | ||||||||||||||||||||
| PR |  M Neuchrist N Pasha | 3 | 6 | [10] | WC | S Collard B Holt | 2 | 6 | [3] | ||||||||||||||||||
| WC | Sebastien Collard B Holt | 6 | 0 | [12] | 1 | R Maytín J Withrow | 2 | 63 | |||||||||||||||||||
| 3 | A Lawson M Polmans | 6 | 6 | 3 | A Lawson M Polmans | 6 | 77 | ||||||||||||||||||||
| ITF |  Shintaro Imai B Saraiva | 1 | 3 | 3 | A Lawson M Polmans | 6 | 77 | ||||||||||||||||||||
 E Couacaud G Sakharov | 65 | 3 | A Harris  Z Li | 4 | 65 | ||||||||||||||||||||||
| A Harris Z Li | 77 | 6 | 3 | A Lawson M Polmans | 6 | 3 | [10] | ||||||||||||||||||||
| ITF |  E Hoyt  S Mansouri | 6 | 6 | H Hach Verdugo D Novikov | 4 | 6 | [7] | ||||||||||||||||||||
| WC | A Galarneau B Sigouin | 3 | 2 | ITF | E Hoyt S Mansouri | 7 | 6 | ||||||||||||||||||||
| M Janvier T Matsui | 5 | 3 | 4 | JP Fruttero R Gonzales | 5 | 0 | |||||||||||||||||||||
| 4 | JP Fruttero R Gonzales | 7 | 6 | ITF | E Hoyt S Mansouri | 64 | 3 | ||||||||||||||||||||
| H Hach Verdugo D Novikov | 6 | 6 | H Hach Verdugo D Novikov | 77 | 6 | ||||||||||||||||||||||
| M Banes A Santillan | 3 | 4 | H Hach Verdugo D Novikov | 3 | 6 | [10] | |||||||||||||||||||||
 N Gombos  C İlkel | 2 | 4 | 2 | H Reese A Shamasdin | 6 | 4 | [7] | ||||||||||||||||||||
| 2 | H Reese A Shamasdin | 6 | 6 | ||||||||||||||||||||||||
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