Kuttner tumor (KT) was first described in 1896 by Kuttner. It occurs mainly in the submandibular gland and usually presents as a firm and painful swelling. An important aspect of KT is its clinical resemblance to a salivary gland neoplasm. Histologically, the disease is characterized by progressive periductal sclerosis, acinar atrophy, and gland infiltration by lymphocytes. However, for a reliable diagnosis of KT an immunohistochemical analysis of lymphocyte subtypes is required. We report a case of KT that involved minor salivary glands of a patient that was undergoing radiotherapy in the head and neck region.