Collision tumour is the concrescence of two neighbouring independent neoplasm occurring in the same site. Collision tumours are rare and are reported in various organs. Collision tumours in breast are reported in various combinations. The treatment of these tumours is not tailored and prognosis depends on the histologic type and pathologic stage of the most aggressive component. We report a rare case of breast collision tumour of infiltrating ductal carcinoma and squamous cell carcinoma of skin overlying breast in a 44-year-old female.