Osborn Correctional Institution (OCI) is a state prison 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. It housed the state's execution chamber from 1994 to 2015 when was capital punishment was declared unconstitutional. It also housed the male death row inmates until 1995 when they were transferred to the nearby Northern Correctional Institution.