Presents data from the National Inmate Survey (NIS), 2011-12, conducted in 233 state and federal prisons, 358 local jails, and 15 special correctional facilities (operated by U.S. Armed Forces, Indian tribes, or U.S. Immigration and Customs Enforcement (ICE)) between February 2011 and May 2012, with a sample of 92,449 inmates age 18 or older and 1,738 inmates ages 16 to 17. This report includes estimates of nonconsensual sexual acts, abusive sexual contacts, inmate-on-inmate and staff-on-inmate victimization, and level of coercion. It provides the first-ever national-level estimates of sexual victimization of juvenile inmates ages 16 to 17 held in adult facilities. The report also presents findings on reported sexual victimization by selected demographic and other inmate characteristics, including measures of serious mental illness for the first time.