The original 18-item Job Engagement Scale (JES18) operationalizes a multidimensional hierarchical conceptualization of the investment and expression of an individual's preferred self in-role performance. Encompassing three dimensions (i.e., physical, cognitive, and emotional), job engagement is a known predictor of organizational performance and personal outcomes. Using a sample (N = 7185) of military and civilian personnel nested within 59 work units in the Canadian Armed Forces (CAF) and Canadian Department of National Defence (DND), we developed and cross-validate a 9-item short-form (the JES9) of the original JES18 in English and French. Results demonstrated that both linguistic versions the JES9 and JES18 yielded comparable psychometric properties. The scales also displayed measurement invariance as a function of participants' sex (male/female), employee type (civilian/regular force/primary reserve), and role (supervisor/employee). Finally, the associations between scores on the JES9 and the JES18 and a series of covariates (i.e., employees' psychological needs for competence, autonomy, and relatedness, burnout, and turnover intentions) were assessed. Collectively, results highlight the strong psychometric soundness of the English and French versions of the JES9 and the JES18 for organizational practitioners and academics.