Idaho Maximum Security Institution

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Idaho Maximum Security Institution (IMSI) is a high-security state prison near Boise, Idaho, USA. It opened in November 1989 to confine Idaho's most violent offenders.

The compound is located within a double perimeter fence reinforced with razor wire, an electronic detection system and a 24-hour armed perimeter patrol. The offender population is comprised of a large number of mental health offenders, including civil commitments. Thirty beds are dedicated for prisoners with acute mental illness. IMSI has restrictive housing beds dedicated to administrative segregation, disciplinary detention and death row. The remaining beds are allocated for close-custody general population offenders.

IMSI is part of the six-facility South Boise Prison Complex.