Tubular adenoma of the breast is a rare benign tumor with cytological findings similar to those of fibroadenoma. We report a case of tubular adenoma of the mammary gland in a 23-year-old female, with emphasis on the cytological findings. The cytological smears show abundant benign bimodal ductal cells arranged mainly in tubular structures as in pericanalicular fibroadenoma, and also small amounts of condensed secretions in the ductal lumen or in the background. Such secretions may be one of the important findings for the differential diagnosis between fibroadenoma and tubular adenoma of the breast by fine needle aspiration cytology.