After a period of mass incarceration that spanned the 1970s through the 2010s, the United States remains the leading incarcerator in the world. Incarceration rates in the United States outpace those of other countries by several hundred per 100,000. Incarceration rates began to decline slightly in 2009, when there was a loss of fiscal, political, and moral will for mass incarceration policy and practices. First, the onset of smart decarceration approaches, the historical context from which smart decarceration stems, and the societal momentum that led to the conceptualization of smart decarceration are described. Smart decarceration is a lead strategy in social work that has been adopted by the American Academy of Social Work and Social Welfare as one of the 12 Grand Challenges for Social Work for the decade 2015–2025. Finally, an overview of the current status of smart decarceration and details shifts and initiatives to pursue at the intersection of social work and smart decarceration is provided.