The United Nations High Commissioner for Refugees (UNHCR) estimates that more than 100 million people around the world were forcibly displaced as of May 2022 (UNHCR 2022). 1 This includes over 25 million refugees and over 50 million internally displaced persons (IDPs) (UNHCR 2021). The share of the world's population that has been forcibly displaced because of conflict, political violence, persecution, and political, economic, and environmental crises grew from 1 in 167 in 2012, to 1 in 88 in 2021 (UNHCR 2021). 2 While conflict is a major cause of forced displacement, the climate crisis is increasingly forcing people to leave their homes. In the last 11 years, disasters such as floods and droughts have driven a larger proportion of internal displacement than conflict (IDMC 2021).Forced displacement can profoundly affect social cohesion among and between displaced persons, host communities, and communities to which displaced persons return. World Bank (forthcoming) defines social cohesion as "a sense of shared purpose, trust and willingness to cooperate among members of a given group, between members of different groups, and between people and the state." 3 This report focuses on social cohesion between forcibly displaced persons and host communities. Forced displacement may undermine or strengthen social cohesion through several mechanisms, including the trauma or mobilization effects of the displacement experience, its impact on social ties and economic and human capital accumulation, and the perception or reality of the impacts of population inflows on goods, services, markets, jobs, and the environment. Despite the clear connection between forced displacement and social cohesion, more research on the topic is needed to better inform policies and development investments.social cohesion between and within displaced populations and host communities. 4 The background studies and report are part of a joint research program led by the World Bank, the United Kingdom (UK) Government, and UNHCR that seeks to expand global knowledge on forced displacement.The background studies are geographically and methodologically diverse. They examine social cohesion in a variety of low-, middle-, and high-income countries across Africa, Asia, Central and South America, and Europe. The studies also employ a wide range of research designs including rich, qualitative case studies, natural experiments, survey experiments, and cross-national quantitative analyses.This report employs a framework centered on five broad themes to synthesize the diverse findings of the background studies. The first four themes explain how forced displacement affects social cohesion. First, forced displacement directly affects social cohesion outcomes among the displaced by reshaping their lives, including their socioeconomic status, educational outcomes, civic engagement, and psychological experiences. Second, displacement affects social cohesion by shaping the attitudes and behavior of host communities. Third, host communities' social, economic, and poli...