Inter-group social trust is one of the main elements for peacebuilding and, as a common feature of civil wars, Forced Internal Displacement is creating further complexities and challenges for post-war inter-group social trust. However, research revealed that among the internally displaced people, some tend to have a higher level of post-war inter-group trust compared to the other IDP. Surprisingly, an analysis based on this topic revealed that only a small number of studies are focusing on the condition of Internally Displaced People’s post-war intergroup social trust in the long run. This study examines the inter-group social trust of internally displaced people to provide a theoretical explanation for the following question; under what conditions the internally displaced people tend to trust more/less the conflicting party in the post-war context? With an examination of the social psychology research, this thesis argues that under the condition of postwar the IDP who have experienced continuous pre-war inter-group contact the post-war intergroup social trust will be stronger than the IDP who do not have such inter-group contact experience. The reason behind this expectation is the expected effect of inter-group contact on eliminating the prejudices and promoting the ‘collective knowledge’ regarding the war and displacement, thus promoting inter-group trust. This research is collected data from two groups of internally displaced people of Cyprus; IDP displaced from heterogeneous areas and homogenous areas, using the method of qualitative single case analysis. The findings show strong support for the expected causal relationship.