The 1977 Rothmans Canadian Open was a tennis tournament played on outdoor clay courts at the National Tennis Centre in Toronto in Canada that was part of the 1977 Colgate-Palmolive Grand Prix and of the 1977 WTA Tour. The tournament was held from August 15 through August 22, 1977.
Jeff Borowiak defeated Jaime Fillol 6–0, 6–1
Regina Maršíková defeated Marise Kruger 6–4, 4–6, 6–2
Bob Hewitt / Raúl Ramírez defeated Fred McNair / Sherwood Stewart 6–4, 3–6, 6–2
Delina Ann Boshoff / Ilana Kloss defeated Rosemary Casals / Evonne Goolagong Cawley 6–2, 6–3