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
← 1977 · Canadian Open · 1979 →

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]

Finals

Men's singles

Eddie Dibbs defeated José Luis Clerc 5–7, 6–4, 6–1

• It was Dibbs' 4th title of the year and the 18th of his career.

Women's singles

Regina Maršíková defeated Virginia Ruzici 7–5, 6–7^(9–11), 6–2

• It was Maršíková's 2nd title of the year and the 3rd of her career.

Men's doubles

Wojciech Fibak / Tom Okker defeated Colin Dowdeswell / Heinz Günthardt 6–3, 7–6

• It was Fibak's 6th title of the year and the 33rd of his career. It was Okker's 6th title of the year and the 77th of his career.

Women's doubles

Regina Maršíková / Pam Teeguarden defeated Chris O'Neil / Paula Smith 7–5, 6–7, 6–2

• It was Maršíková's 3rd title of the year and the 4th of her career. It was Teeguarden's only title of the year and 15th of her career.