1991 Canadian Open – Women's singles

Jennifer Capriati defeated Katerina Maleeva in the final, 6–2, 6–3 to win the women's singles tennis title at the 1991 Canadian Open.

Steffi Graf was the reigning champion, but chose not to participate.

Seeds
The top eight seeds received a bye to the second round. • # 🇦🇷 Gabriela Sabatini (semifinal)

• # Manuela Maleeva-Fragniere (semifinal)

• # 🇺🇸 Jennifer Capriati (champion)

• # 🇧🇬 Katerina Maleeva (final)

• # 🇫🇷 Nathalie Tauziat (third round)

• # Helena Suková (quarterfinal)

• # n/a

• # 🇺🇸 Amy Frazier (quarterfinal)

• # Natalia Zvereva (quarterfinal)

• # 🇵🇪 Laura Gildemeister (quarterfinal)

• # 🇨🇦 Helen Kelesi (third round)

• # 🇯🇵 Naoko Sawamatsu (third round)

• # 🇺🇸 Marianne Werdel-Witmeyer (second round)

• # 🇮🇹 Katia Piccolini (first round)

• # Claudia Kohde-Kilsch (first round)

• # Regina Rajchrtová (third round)