Social inclusion emerged as a response to the growing number of socially excluded and marginalized populations. The focus of social inclusion is on fostering “social, economic, and political participation” and engagement, helping to create “a sense of belonging” for diverse groups in society. Today, social inclusion is seen as a crucial determinant of health, integral to promoting health and well-being, especially among the socially excluded and marginalized. The concept of social inclusion is closely tied to equality, social cohesion, and human rights, aiming to address barriers that prevent meaningful societal participation. It promotes a positive approach rather than concentrating on the problems faced by individuals. Social inclusion highlights the importance of an inclusive society where people lacking opportunities to engage in various societal aspects become more integrated. This chapter first explores the concept of social inclusion, then examines the related concept of social exclusion. Next, it discusses the intersection of social inclusion, social exclusion, and health promotion. The chapter concludes with strategies and means to promote social inclusion in society.