The Osborn Correctional Institution (OCI), formerly known as the Connecticut Correctional Institution – Somers,[1] is a medium-security state prison that includes a high-security mental health unit for men of the Connecticut Department of Correction located in Somers, Connecticut.

It has capacity of 1900 inmates, making it amongst the largest prisons in the state and one of the oldest operational facilities in Connecticut.

It housed the state's execution chamber[2] until 2015, when capital punishment was declared unconstitutional.

[3] It also housed male death row inmates until 1995 when they were transferred to the nearby Northern Correctional Institution.

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