Abstract: Organizational development is the key to success depending highly on the behaviors of individuals working within. This study has tested the impact of two types of proactive behaviors i.e., proactive problem solving (PPS) and proactive idea implementation (PII) on organizational development. The self-efficacy of employees is taken as a moderator on the direct relationship of PPS and PII with organizational development (OD). Data is collected from managerial employees of manufacturing organizations in Rawalpindi, Islamabad, and KPK region in Pakistan, through self-administered survey questionnaires. Results show that PPS and PII have a positive significant relationship with organizational development. Self-efficacy strongly moderates the direct relationships of PPS and PII with OD in such a way that the higher the levels of self-efficacy, the stronger will be the relationship of PII and PPS with OD. This research provides useful insights into the organizational development literature highlighting the importance of proactivity and self-efficacy resources of employees.