Temporal bone osteomas are relatively rare entity which has incidence rate of 0.1% – 1% of all benign tumours of skull. It is a slowly growing benign tumor of temporal bone. We report a rare case of mastoid osteoma. A 26 years old male patient presented to us with right post auricular bony swelling of approximately 4 cm. Diagnosis of temporal bone osteoma was made after proper investigations like histopathology and High Resolution Computed Tomography (HRCT) temporal bone. Complete excision was done with good cosmetic outcome.