Drawing on the resources-based and the contingency theories, this study investigated the role of strategic planning process and effectiveness of Jordanian interior ministry. The study used face-to-face questionnaire distribution technique to gather data from 243 respondents. Because the sample frame was unavailable, a non-probability, purposive selection strategy was utilized to choose the participating individuals. The findings indicated that three dimensions of strategic planning process (scanning intensity, planning flexibility, and locus of planning) were significantly related to organizational effectiveness and hence supported. While the relationship between planning horizon and organizational effectiveness was not supported. The implication and conclusions were highlighted