The 1974 Rothmans Canadian Open was a tennis tournament played on outdoor hard courts at the National Tennis Centre in Toronto in Canada that was part of the 1974 Commercial Union Assurance Grand Prix and of the 1974 WTA Tour. The tournament was held from August 12 through August 18, 1974.
Guillermo Vilas defeated Manuel Orantes 6–4, 6–2, 6–3
- It was Vilas' 5th title of the year and the 7th of his career.
Chris Evert defeated Julie Heldman 6–0, 6–3
- It was Evert's 16th title of the year and the 36th of her career.
Manuel Orantes / Guillermo Vilas defeated Jürgen Fassbender / Hans-Jürgen Pohmann 6–1, 2–6, 6–2
- It was Orantes' 3rd title of the year and the 23rd of his career. It was Vilas' 6th title of the year and the 8th of his career.
Gail Chanfreau / Julie Heldman defeated Chris Evert / Jeanne Evert 6–3, 6–4
- It was Chanfreau's 1st title of the year and the 1st of her career. It was Heldman's 1st title of the year and the 1st of her career.