HM Prison Doncaster, is a Category B men's private prison, located in the Marshgate area of Doncaster in South Yorkshire, England. The prison is operated by the Serco Group.
Doncaster Prison was built on the site of Doncaster Power Station, and opened in 1994. Management of the prison was originally contracted out by the Home Office to Premier Prison Services Ltd, a joint venture between Serco and US company Wackenhut Corrections. In 2005, Serco bought out Wackenhut and now runs the prison alone.
In 1999, the then Home Secretary Jack Straw was criticised for awarding Doncaster Prison a Charter Mark, when it emerged that Doncaster had worst suicide record of any prison in England and Wales. Jack Straw defended his decision as an "unfortunate coincidence of timing".