Oral cavity T-cell lymphoma occurs rarely. This case report describes a patient with such a tumor. The case was a 48 year old male presenting with a painless ulcer on palate mucosa. He had suffered from nasal obstruction. Pathology revealed the presence of a T-cell lymphoma tumor in the palate. Though rare, the signs and symptoms of the case suggest that T-cell lymphoma should be considered in the differential diagnosis of oral cavity lesions. Malignant lymphoma is a neoplasm originating from lymphocytes, lymphocyte precursor cells, or cells generated during the multipotential differentiation of a stem cell [1]. Approximately 80% of lymphomas originate from B lymphocytes [2]. Non-Hodgkin’s lymphoma (NHL) tends to invade tissues and organs that inherently do not consist of lymphoid cells [3]. Non-Hodgkin’s lymphoma may be located in oral soft tissues, but oral NHL usually involves B cell system, and less often T-cell system [2]. Palatal and nasal lymphomas are rare, and the majority of lymphomas in this region originate from B cells [4]. Since an early detection of hard palate tumors is difficult by clinical examination, the vast majority of such tumors are detected after maxillary or sphenoid bone invasion [5]. The present case report introduces a case of T-cell lymphoma involving the hard palate, the maxillary sinus and the nasal cavity. This type of lymphoma is rare in oral cavity and needs to special tests for correct diagnosis.