Background: During pregnancy and nursing, palpable breast lumps are frequent initial signs. Pregnancy-related breast disorders are those identified during pregnancy, within a year after giving birth, or during nursing.The present study assessed breast masses in pregnant and lactating women with Fine Needle Aspiration Cytology (FNAC). Materials & Methods: 56 females with breast masses during pregnancy and lactation period were assessed using FNAC. A 20 mL syringe with a Franzen handle and a 23– 24 gauge needle. Multiple passes in the lesion while maintaining negative pressure were used to perform aspirations. After that, the aspirate was applied to at least five slides; four of them were allowed to air dry, and one was fixed in 95% ethanol. Results: 15 breast masses arose during pregnancy (16 - 32 weeks) and 41 breast masses arose during post–partum period or lactation. The difference was significant (P< 0.05). Breast lesions were non – neoplastic lesions (40) such as Galactocele in 10, Acute mastitis in 5, Chronic mastitis in 3, Fat necrosis in 6, Benign proliferative breast lesion in 7, Benign breast lesions or lactational changes in 1, and Subareolar abscessin 8 cases. Neoplastic lesions (16) were PABC (Ductal carcinoma)in 3, Lactating adenoma in 3 and Fibroadenoma in 10 cases. The difference was significant (P< 0.05). Conclusion: Between benign breast lesions and malignant lesions, FNAC is used in the cytomorphological identification of a variety of breast disease patterns during pregnancy and breastfeeding.