Objective: This article presents a validation study to examine the factor structure of an instrument designed to measure professional suitability for social work practice. Method: Data were collected from registered social workers in a provincial mailed survey. The response rate was 23.2%. After eliminating five cases with multivariate outliers, confirmatory factor analysis using maximum likelihood estimation was performed on 285 cases. Results: A 22-item four-factor model achieved an acceptable good fit. Reliability testing results indicate an overall Cronbach's alpha valued at 0.90 and subscale alphas ranged between 0.75 and 0.89. Conclusion: Findings affirm good-to-excellent internal consistency of the Professional Suitability scale with two previous studies and provide acceptable results on construct validity. (Contains 4 tables and 2 figures.)