This chapter discusses special populations within corrections including elderly prisoners, prisoners with HIV/AIDS, mentally ill prisoners, and long-term prisoners. It also covers juvenile corrections, including the history of the juvenile justice system in the US, why juveniles are treated differently than adults, challenges with serious juvenile offenders and gangs, and the future of the juvenile justice system. The chapter outlines topics like the aging correctional population, managing HIV-infected inmates, challenges with the incarcerated mentally ill, the extent of youth crime, and factors considered in sanctioning juvenile offenders.