
The Algoma Treatment and Remand Centre is a medium/maximum security prison located in Sault Ste. Marie, Ontario Canada. The entire centre has a capacity of 104 beds.

The Brockville Jail is a jail in Brockville, Ontario operated by the provincial Ministry of the Solicitor General. It is the oldest operational jail in the province.
The Central East Correctional Centre is a medium/maximum security prison located in Lindsay, Ontario. Inmates in this facility manufacture licence plates for the province. It is operated by the Ministry of the Solicitor General.

The Central North Correctional Centre is a maximum security prison located in Penetanguishene, Ontario, Canada. During its period of private management from 2001 to 2006, it was the only privately-run adult correctional facility in Canada.
Collins Bay Institution is a multilevel correctional facility in Kingston, Ontario, Canada, and falls under the supervision of Correctional Services of Canada. The facility was opened in 1930, and is now the oldest operational federal penitentiary in Ontario. The main prison is medium security, with a minimum security facility residing on the same property. A 96-bed maximum security unit is also operational.

The Elgin-Middlesex Detention Centre also known as EMDC, is a 450-bed maximum security jail located in London, Ontario. Concerns have recently been raised about the security of the inmates at the prison as well as prison overcrowding.

Maplehurst Correctional Complex is a correctional facility located in Milton, Ontario for women and men 18 years of age and older. It is a combined maximum security detention centre for remanded prisoners, and medium/maximum correctional centre for offenders sentenced to less than two years. It used to have a serrate wing for minors but no longer houses them. It is also known colloquially as the "Milton Hilton" or "Muppethurst". In 1972, the government started a $13.5 million construction project for the Maplehurst Correctional Centre. It was completed in 1974 and continues to operate to this day. Sod was turned on the project on February 9, 1973.

The Monteith Correctional Complex is a medium/maximum security prison located in Monteith, a community in Iroquois Falls, Ontario.

The North Bay Jail is a jail located in North Bay, Ontario.

The Ottawa-Carleton Detention Centre (OCDC) is a correctional facility in Ottawa, Ontario. It opened in 1972.

The Toronto East Detention Centre, often simply referred to as The East, is a remand facility located in Toronto, Ontario, Canada, in the former borough of Scarborough. It is located to the southwest of Eglinton Avenue and Birchmount Road. The facility was known as the Metropolitan Toronto East Detention Centre until the Metropolitan Municipality of Toronto was amalgamated in 1998.