Benign fibrous histiocytoma(BFH) is a mesenchymal cell-originated tumor composed of cells with fibroblastic and histiocytic differentiation. BFH occurs predominantly on sun-exposed skin of extremities. Oral BFH lesions are uncommon. The majority of oral lesions includes the soft tissue but not the jaw bones. The lesion appears as well-defined multilocular radiolucencies associated with bony swelling when it occurs on the jaw. The lesion induces the thinning and expansion of the cortex and shows many thin, indistinct septa in the lesion. Surgical excision is the choice of treatment. The recurrence rate is low and metastasis has not been reported. We report the clinical, radiographic and microscopic findings of a BFH case occurred in the mandible with literature reviews.