Glomus tumors are uncommon, with an estimated incidence of 1.6%. Cytological descriptions of this tumor are few. We report a 15-year-old boy presenting with a painful subungual swelling. Fine needle aspiration cytology showed uniform cells with homogeneous chromatin and scanty cytoplasm. Cytology was reported as "suggestive of glomus tumor". Histopathological examination confirmed the diagnosis. Careful cytomorphological examination supported by appropriate clinical history should suggest the diagnosis of glomus tumor and help in preoperative diagnosis.