While the United Nations High Commissioner for Refugees (UNHCR) has a record of approximately 1.5 million Syrian refugees in Lebanon, no studies have focused on understanding the processes of acculturation and sociocultural/psychological adaptation among them in Lebanon. The aim of this study was to evaluate Syrian refugees’ patterns of acculturation and adaptation; to evaluate their association with social and psychological factors such as perceived discrimination, cultural distance, and attachment; and to look for predictors of acculturation and adaptation. The sample consisted of 241 Syrian refugees between 18 and 64 years of age. Correlations were found between acculturation and adaptation, both of which were impacted by reasons for displacement. Moreover, results showed that low cultural distance, perceived discrimination, and insecure attachment predicted both psychological and sociocultural adaptation, whereas lower perceived discrimination, attachment avoidance, and high attachment anxiety predicted high host acculturation. Findings are discussed in light of potential interventions facilitating refugees’ adaptation to the Lebanese culture.