Two hundred eighty-three public-sector employees experiencing a workplace reorganization completed surveys assessing the relationships between job involvement and job insecurity on self-report measures of psychological, behavioral, and physical outcomes. Using C. L. Hulin's (1991) job adaptation theory, differential predictions were made regarding the specific outcomes of job insecurity for high job involvement versus low job involvement employees. Results indicate that employees who were highly invested in their jobs were most adversely affected by job insecurity. Specifically, they reported more negative job attitudes, more health problems, and a higher level of psychological distress than their less involved counterparts when they perceived their jobs to be threatened.