OBJECTIVE: To examine the occurrence of breast fibroadenomas in postmenopausal patients referred for breast biopsy.DESIGN: A retrospective review of breast biopsy outcome and of patient demographics, including menstrual and hormonal status.SETTING: The Tucson Breast Center, a large outpatient breast cancer detection clinic affiliated with the University of Arizona Health Sciences Center in Tucson, Arizona.PARTICIPANTS: All women seen at the Tucson Breast Center between 1985 and 1990 who were referred for breast biopsy.RESULTS: A total of 100 fibroadenomas were found in 709 breast biopsies whose results were known. Fifty‐two of these were in premenopausal women and 44 in postmenopausal women; the menopausal status of four women was unknown. In postmenopausal women, 11 of the 44 patients reported hormone use. Fibroadenomas constituted 20% (39 of 195) of the benign masses and 12% (39 of 339) of all breast masses in postmenopausal women. Fibroadenomas constituted 10% (44 of 447) of all biopsies in postmenopausal women, including those with breast masses, abnormal calcifications, or other lesions.CONCLUSION: Noncalcified fibroadenomas of the breast are not confined to young women and may constitute a small but noteworthy proportion of lesions coming to breast biopsy in postmenopausal women.J Am Geriatr Soc 44:61–64, 1