Background: Breast cancer is the most common cause of cancer in women worldwide. Although it is a disease of postmenopausal and elderly age group, approximately 5.6% of breast cancer patients are ≤40 years. It has aggressive clinical behavior with poor outcomes as compared to the elderly group. This study was carried out to determine the pattern of breast cancer in young females in Minia district. Methods: This is a retrospective cohort study collecting data in Minia university hospital and Minia oncology center from 2017 to 2021, for patients with primary breast cancer who were diagnosed and pathologically proven breast cancer below age of 40. Patients were staged according to TNM staging system (according to American Joint Committee on Cancer AJCC 2017) Immunohistochemistry was used for molecular classification. Results:  Total number of cases of breast cancer cases below age of 40 was 279 which represent 10% of 2760 cases. About 10.8% of patients had family history, 91% of patients presented with infiltrating ductal carcinoma and  (82.4%) had Grade II disease . About 98 (35.7%) cases were luminal A, 30.5% were luminal B. HER2 positive in 47cases (16.8%) and triple negative patients 49 cases (17.6%).   Majority of patients had negative ovulation induction, stage II 45.9%, nodal status N1 34.1% . Conclusion: The reflection of molecular subtypes on overall survival was not statistically significant but ki67 and association of primary tumor stage T and the prevalence of metastasis to lymph nodes were statistically significant.