The concept of the Social Sustainability Index (SSI) offers valuable insights into the sustainability image across European regions. By capturing the multifaceted dimensions of social well-being and inclusivity, SSI serves as a powerful tool for assessing regional sustainability performance, guiding policy formulation, and fostering stakeholder engagement. While challenges remain, the growing recognition of social sustainability as a key determinant of overall sustainability underscores the importance of advancing SSI implementation in European regions. Through collaborative efforts and innovative approaches, SSI can contribute to building more resilient, equitable, and sustainable communities across Europe.