Introduction: Among radiological exams, tomographic exams are considered by several authors as the gold standard for assessing bone loss of the glenoid. The anteroinferior quadrant of the glenoid, in addition to be the most frequent place for insertion of anchors and screws. No studies have been identified in the literature related to the classification of the morphology of the anterior border of the glenoid based on subtypes so far. Objective: To describe a new tomographic classification of the anterior border of the glenoid based on the assessment of tomographic images (CT) of the shoulder of adult patients, in addition to evaluating the intraobserver (Kappa simple) and interobserver (Kappa Fleiss) agreement of the proposed classification.Methods: Cross-sectional observational study, approved by the institution's Research Ethics Committee. The sample analyzed in the study consisted of 80 shoulder CT scans with normal glenoids, that is, without bone changes. Regarding age, the sample had an average age of 45 (± 15.10) years. 45 examinations were observed in male and 35 female patients. As for laterality, 47 on the left and 33 on the right. Four examiners made the classification of the anterior border of the glenoid on CT images, independently and blindly; two specialists in shoulder surgery, examiner (A and C), and two musculoskeletal radiologists, examiner (B and D). The examiners used anonymized digital images of shoulder CT scans, in DICOM format, using the Horos system (Nimble Co, Annapolis, USA). After 30 days, new blind assessments were performed to calculate the intraobserver agreement. The positions 3:00h and 4:30h, in axial sections, were evaluated separately for the classification of the morphology of the anterior border of the glenoid after oblique correction. During the classification, the examiners had at their disposal illustrative drawings of the four proposed subtypes in addition to a videoconference with guidance on the study. Results: Regarding the agreement between the moments (intraobserver) that evaluated the edges of the glenoid, in the first and second evaluation, in the position 4: 30h and in the position 3: 00h, the examiners' evaluations obtained a simple Kappa almost perfect, close to 1, 0.The agreement between the examiners (interobserver) was reasonable at the 3:00h position and moderate at the 4:30h position at both times. Conclusion: Four subtypes of morphology of the anterior border of the glenoid were identified, with no statistically significant relationship with sex, laterality and age group. The intraobserver agreement was almost perfect for assessing the classification of the anterior border of the glenoid.The interobserver assessment was reasonable to moderate. The proposed classification has the potential to contribute to glenohumeral instability surgeries.