| Date | October 27–28, 1973 |
|---|---|
| Convention | Royal York Hotel, Toronto, Ontario |
| Resigning leader | Robert Nixon |
| Won by | Robert Nixon |
| Ballots | 3 |
| Candidates | 4 (6) |
The Ontario Liberal Party leadership election, 1973, was held on October 27–28, 1973 to replace Robert Nixon who had announced his retirement in 1972. After a change of heart he reversed his decision to retire and entered the leadership race to retain his position. He defeated Norman Cafik on the third ballot by 317 votes.