The Ionia Maximum Correctional Facility (ICF), also known as "I-Max"^[1] is a state prison located in Ionia, Michigan, USA.

I-Max was opened in 1987 and consists of five maximum security level V housing units and two medium security level II housing units. It is one of five maximum security men's prison facilities in Michigan, along with Marquette Branch Prison in Marquette, Alger Maximum Correctional Facility in Munising, Baraga Maximum Correctional Facility in Baraga, and Standish Maximum Correctional Facility in Standish. Although the Ionia Maximum Correctional Facility was once the state's only supermax prison, Michigan downgraded the facility from a level VI (or supermax) to a level V maximum security prison in 2004.^[2]

Three of the level V housing units are designated 'general population'. The remaining two are used for administrative segregation (a unit in which prisoners are confined to their cells for breaking prison rules), temporary segregation, detention, and secure outpatient treatment. The level II facility consists of a 280-bed building separated into two units. Level II prisoners have access to a variety of recreational activities and are allowed to work in the prison and for Michigan State Industries, a factory that employs low-risk prisoners.^[3]