This study explores the relationships between job insecurity, co-worker support, social loafing and turnover intention, specifically the mediating effect of turnover intention in the relationship between job insecurity, coworker support and social loafing. It uses social exchange theory and norm of reciprocity theory to look investigate turnover intention. Data were collected from a questionnaire distributed to 222 restaurant employees in Mersin, Turkey. Structural equation modelling was used to test the research hypotheses. While the mediating effect of turnover intention in both the relationship between co-worker support and social loafing and between affective job insecurity and social loafing is fully supported, the mediating effect of turnover intention in the relationship between cognitive job insecurity and social loafing is only partially supported. The theoretical and managerial implications of these findings are discussed.