Fibro osseous lesions are poorly defined group of lesions, characterized by replacement of normal bone by a benign connective tissue matrix. Fibro osseous lesions of jaws such as Fibrous Dysplasia, Osseous Dysplasia and Ossifying Fibroma. Theses lesions have common characteristics that include common clinical, radiographic and microscopic features. Clinicians and pathologist experience difficulty in diagnosis and differentiation due to its significant overlapping of clinical and histological features. Many diagnostic terms have been used for these lesions in the literature. Therefore, proper categorization requires good correlation of the history, clinical findings, radiographic characteristics, operative findings and histologic appearance. Theses lesions have undergone frequent renaming and reclassification due to its varied features. This revies article is an attempt to simplify the understanding of this diverse group of lesions.