| 1978 Rothmans Canadian Open | |
|---|---|
| Date | August 14–20 |
| Edition | 89th |
| Surface | Clay / outdoor |
| Location | Toronto, Ontario, Canada |
| Venue | National Tennis Centre |
| Champions | |
| Men's singles | |
 Eddie Dibbs[1] | |
| Women's singles | |
 Regina Maršíková | |
| Men's doubles | |
 Wojciech Fibak /  Tom Okker[2] | |
| Women's doubles | |
| Regina Maršíková / Pam Teeguarden | |
The 1978 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 1978 Colgate-Palmolive Grand Prix and of the 1978 WTA Tour. The tournament was held from August 14 through August 20, 1978.[3]
Eddie Dibbs defeated 
José Luis Clerc 5–7, 6–4, 6–1
Regina Maršíková defeated 
Virginia Ruzici 7–5, 6–7(9–11), 6–2
Wojciech Fibak / Tom Okker defeated 
Colin Dowdeswell / Heinz Günthardt 6–3, 7–6
Regina Maršíková / Pam Teeguarden defeated 
Chris O'Neil / Paula Smith 7–5, 6–7, 6–2
