The deputy premier of Ontario (French: vice-première ministre de l'Ontario) is a minister of the Crown and senior member of the provincial Executive Council (Cabinet).

[2] Sylvia Jones is the 12th and current deputy premier of Ontario, assuming office on June 24, 2022.

[3] Official Opposition Canada portal For much of the province's early history, the position of provincial secretary and registrar of Ontario was the second most powerful position in the Ontario Cabinet.

This role diminished by the 1960s, overtaken by the deputy premier in 1977 and abolished in 1985.

Bette Stephenson, Robert Nixon, Floyd Laughren, Ernie Eves, Jim Flaherty, and Dwight Duncan were all concurrently provincial treasurer or, as that position was renamed in 1993, minister of Finance.