The Ministry of Natural Resources says the changes will eliminate 28 full-time jobs and 102 seasonal positions, and will save $7.1 million a year.
The overnight Ranger Program will be replaced with a new Stewardship Youth Ranger Program in the day time only.
Minister of Natural Resources Michael Gravelle says the staff cuts and other changes will help the government eliminate a deficit of nearly $15 billion and modernize the way the ministry does business.
There are 334 provincial parks in Ontario, 104 of which will continue to provide visitor services.
The 10 parks that will be downgraded (with the nearest community in brackets) are:
Caliper Lake (Nestor Falls)
Fushimi Lake (Hearst)
Ivanhoe Lake (Foleyet)
Mississagi (Elliot Lake)
Obatanga (between Wawa and White River)
Rene Brunelle (Kapuskasing)
The Shoals (Chapleau)