Extending the earlier work of B. M. Byrne and P. Baron (1990), the factorial invariance of the 21-item Beck Depression Inventory (BDI) was tested using 351 non-clinical adolescent males and 334 non-clinical adolescent females. All subjects were in grades 9 through 12 and attended the same secondary school in a large metropolitan area in central Canada. Participants, who ranged in age from 12 to 18 years, completed the BDI and other assessment measures during one regular class period. All analyses were based on confirmatory factor analytic procedures within the framework of covariance structure modeling. Despite the differential loading pattern of Item 20 (hypochondria) for females, a three-factor structure that comprised one second-order general factor of depression and three first-order factors representing negative attitudes, performance difficulty, and somatic elements was found to be invariant across gender. Furthermore, except for two additional inventory items (items 8 and 10, self-accusation and crying, respectively), the remaining BDI measurements were group-invariant. The results are expected to be of substantial interest to both researchers and clinicians whose concerns focus on depression as it affects adolescents. A 40-item list of references is included. Two data tables and two figures are provided. Items comprising the BDI are appended. (RLC)