This research examines how budgetary participation influences organizational citizenship behavior (OCB) among faculty in Indonesian higher education and the potential mediating role of job satisfaction. Drawing on self-determination theory, the study also investigates whether these relationships differ between public and private institutions. A survey-based, quantitative approach was used, with 350 faculty members participating—149 from public and 201 from private universities. Causal mediation analysis revealed that, overall, job satisfaction does not mediate the effect of budgetary participation on OCB; both variables independently impact OCB. However, in public universities, job satisfaction does act as a mediator, linking budgetary participation to OCB. These findings suggest that the institutional context may shape how participative budgeting practices translate into extra-role behaviors through employee satisfaction. The study contributes to understanding the interplay between budgetary involvement, satisfaction, and discretionary workplace behavior in higher education settings.