This research explored the relationship between co-worker support, job insecurity, organizational commitment, and turnover intention. It also discusses the mediating effect of turnover intention through the application of social exchange theory. The process involved the collection of data using questionnaires distributed to 285 employees of fast-food restaurants in Bandung, Indonesia, after which the hypotheses formulated were tested using structural equation modeling. The results showed that the mediating effect of turnover intention on the relationship between co-worker support and social loafing, affective job insecurity and social loafing, as well as cognitive job insecurity and social loafing is partially supported.