The Office of the Legislative Assembly of Ontario was created in 1974 as a result of a study by a government commission.

The first female Legislative Pages are welcomed into the Legislative Page Program in 1971. The program is open to Ontario students in Grades 7 & 8, allowing them to work at and learn about the Legislature during a brief work term at the Legislative Building.

Bill Davis succeeds John Robarts as Ontario Premier on March 1, 1971. During his terms in office, his administration increased health care and education systems in addition to expanding bilingual services. He would continue in power until his retirement in 1985.

With the passage of the Ontario Arboreal Emblem Act in 1984, the Eastern White Pine became the official tree of the province.