Fibrous dysplasia of the bone is a relatively rare condition characterized by fibrous tissue replacement of skeleton, it may be monostotic with confined to one bone, or polyostotic with situated in many bones. Favored locations are long bones of the lower extremities and fibrous dysplasis may produce defective growth and deformity, pathologic fracture, and pain in any bone, basically the bone structure is replaced to variable degree by avascular fibrous tissue, and formed thin trabeculae of bone. The author experienced 3 cases of fibrous dysplasia that are 2 cases tomonostotic and 1 case of polyostotic lesions and a brief review was done with literatures.