Metastatic tumors of breast are rare and account only for approximately 2% of all malignant breast cancers. Breast metastasis of stomach's signet ring cell carcinoma (SRCC) is also a very rare condition. Herein, we report two rare cases of gastric SRCC metastasis to the breast. First case is a 63-year-old female patient who was admitted to our clinic with swelling in the left breast and arm with enlarged left axillary lymphadenopathy. She was diagnosed with gastric SRCC a year ago. Second case is a 65-year-old woman diagnosed with gastric SRCC who had undergone total gastrectomy two years ago, and had one-year history of operation for kruckenberg's tumor. This patient was admitted to our clinic with two months history of pain and swelling in the left breast. She was also diagnosed as a gastric SRCC metastasis. [Turk J Cancer 2009;39(2):62-65]