This chapter argues for the inclusion of justice as a core social indicator in assessing quality of life. It critically explores the philosophical, methodological, and empirical foundations for measuring justice, highlighting its multiple dimensions—distributive, procedural, recognitional, and restorative. Through global case studies and interdisciplinary insights, the chapter demonstrates how justice metrics can enrich policy frameworks, reveal structural inequalities, and enhance democratic accountability. Despite challenges of subjectivity and politicization, justice remains an indispensable element of well-being. Integrating justice into statistical systems is both an ethical imperative and a transformative step toward building fairer, more inclusive societies.