Orbital lymphoma represents a small fraction of all systemic lymphomas that has been accounted for approximately in 1-2% of non-Hodgkin lymphomas (NHL). Some diagnostic delays might be occurred due to the fact that there are non-specific clinical signs. Furthermore, an orbital CT scan can determine the location of the orbital mass and assist in ophthalmological surgery as well as to obtain an optimal sample for an accurate diagnosis. CT scan was performed and revealed the pattern of orbital lymphoma in order to pursue the proper diagnosis. In accordance to the imaging result, immunohistochemical studies were performed from biopsy specimens of all three patients. It showed that there were a non-Hodgkin's lymphomas originating in the orbit, lids, and oculi adnexa.