The purpose of this study was to validate the Vocational Rehabilitation Engagement Scale (VRES) in a sample of state vocational rehabilitation (VR) service consumers. A total of 277 individuals with disabilities were recruited from Alaska, Kentucky, Florida, Michigan, New Mexico, Texas, Utah, and Wisconsin. The measurement structure of the VRES was evaluated using exploratory factor analysis and confirmatory factor analysis. Exploratory factor analysis results support a one-factor measurement structure of the VRES. Confirmatory factor analysis results also indicated a good model fit for the one-factor measurement model. Internal consistency reliability (Cronbach’s α) for the scores on the VRES was computed to be .94. VR engagement was found to be associated with working alliance, vocational self-efficacy, internal motivation, and VR outcome expectancy in the expected direction. The VRES is a brief, reliable, and valid instrument for assessing VR engagement and contributes to the use of self-determination as a paradigm for improving motivation and engagement of people with disabilities receiving services from state VR agencies.