The basic purpose of this research is to examine the relationship between job satisfaction and turnover intention in the presence of mediating variable of work engagement in hospitals of Lahore, Pakistan. Data was collected through self-administered questionnaire which was distributed among public and private hospital nurses holding positions of nurse or head nurse. The sample size was 270. SPSS and AMOS software was used for demographic and inferential analysis. Results conclude that job satisfaction with determinants of JS (pay, promotion, nature of job etc.) have negative relationship with turnover intention. Results also showed that work engagement has partial mediating role in the relationship of job satisfaction and turnover intention. This study mainly focused on service sector (hospitals) in Lahore. So the results are limited to only service sector which narrow down its generalizability. Current study is cross sectional and longitudinal study is recommended to generalize results. The survey data was collected from nurses of one city that is Lahore it required to do similar research on other cities of Punjab. Various studies in literature have explored relationships among different variables of organizational behavior rather than explaining any other mechanism; they have focused much on their relationships but less on mediating relationship of work engagement.