| Date: | August 8–14 (men) August 15–21 (women) |
| Edition: | 116th (men) / 104th (women) |
| Location: | Montreal, Quebec, Canada (men) Toronto, Ontario, Canada (women) |
| Main Name: | Canadian Open (tennis) Canadian Open |
| Venue: | Rexall Centre |
| Champms: |  Rafael Nadal[1] |
| Champws: |  Kim Clijsters |
| Champmd: | Wayne Black / Kevin Ullyett[2] |
| Champwd: | Anna-Lena Grönefeld /  Martina Navratilova |
The 2005 Canada Masters (also known as the 2005 Rogers Masters and 2005 Rogers Cup for sponsorship reasons) was a tennis tournament played on outdoor hard courts. It was the 116th edition of the Canada Masters, and was part of the ATP Masters Series of the 2005 ATP Tour, and of the Tier I Series of the 2005 WTA Tour. The men's event took place at the Uniprix Stadium in Montreal, Quebec, Canada, from August 8 through August 14, 2005, and the women's event at the Rexall Centre in Toronto, Ontario, Canada, from August 15 through August 21, 2005.
The men's field was led by ATP No. 2 and French Open champion Rafael Nadal, Australian Open and Indian Wells finalist Lleyton Hewitt, and Wimbledon runner-up and Washington winner Andy Roddick. Among other seeds were former World No. 1 and recent Los Angeles champion Andre Agassi, Pörtschach titlist Nikolay Davydenko, Gastón Gaudio, Guillermo Coria and Mariano Puerta.
The women's draw featured WTA No. 2 and Rome winner Amélie Mauresmo, Warsaw runner-up Svetlana Kuznetsova, and Roland-Garros champion Justine Henin-Hardenne. Other top seeds were Australian Open champion Serena Williams, Berlin finalist Nadia Petrova, Kim Clijsters, Anastasia Myskina and Nathalie Dechy.
See main article: 2005 Rogers Masters – Singles. Rafael Nadal defeated Andre Agassi, 6–3, 4–6, 6–2
See main article: 2005 Rogers Cup – Singles. Kim Clijsters defeated Justine Henin-Hardenne, 7–5, 6–1
See main article: 2005 Rogers Masters – Doubles. Wayne Black / Kevin Ullyett defeated 
Jonathan Erlich / Andy Ram, 6–7(5–7), 6–3, 6–0
See main article: 2005 Rogers Cup – Doubles. Anna-Lena Grönefeld / Martina Navratilova defeated Conchita Martínez / Virginia Ruano Pascual, 5–7, 6–3, 6–4