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Male breast cancer constitutes 1% of all breast cancers and 0.2% of all cancers in males. Incidence of bilateral breast cancer in males is less than 2%. Here, a male patient with metachronous bilateral breast cancer diagnosed 23 years after the treatment of the primary tumor is reported regarding his diagnosis, treatment, and prognosis. 76 year-old male patient was treated with radical mastectomy and stage I (T1N0M0) breast cancer was detected and patient was followed without any adjuvant treatment. During follow-up, a second primary tumor was diagnosed in the contralateral breast and modifi ed radical mastectomy was performed. Patient who had stage IIA (T2N0M0) breast cancer was treated with adjuvant tamoxifen and was followed for one year without any evidence disease.