Supervisor support is often argued to be a meaningful predictor of employee engagement; however, existing research has yet to fully support this hypothesis. Drawing from the research on social exchange theory, organizational support theory, and job characteristics model, this study investigates the mediating role of perceived organizational support in the link between supervisor support and employee engagement. How this mediating effect might be moderated by learning opportunities in the job is also considered. Data from a sample of 1,251 employees from state and local government agencies show that supervisor support affects employee engagement both directly and indirectly through its influence on perceived organizational support. In turn, this influences the variance in employee engagement. Results further show that the path linking supervisor support to organizational support is moderated by learning opportunities, such that the positive relationships become invigorated among individuals who reported having opportunities to learn and grow in their job.