Introduction: Mastitis, a benign clinical entity of inflammation of breast parenchyma, is exceedingly rare in males with only few cases reported so far. Case Report: A 37-year-old male, presented with history of lump and discharging nipple of right breast for ten days. On examination the right breast had a well-defined 2x1 cm2 lump at subareolar region. Ultrasound showed an ill-defined heterogenous predominantly hypoechoic area with fine internal echo and no vascularity just beneath the nipple area. Cytosmears showed benign ductal epithelial cells arranged in sheets and clusters intermixed with inflammatory cells composed of neutrophils, lymphocytes, macrophages most of them showing phagocytic activity along with numerous multinucleated giant cells, thus revealing overall cytomorphologic features of mastitis. Conclusion: Mastitis in a male breast is extremely rare. The awareness of this benign entity established on fine needle aspiration will avoid unnecessary surgery.