Ten patients with biopsy-proved lymphoid hyperplasia (pseudotumor) of the orbit were treated with radiation therapy individed sose ranging from 2,500 to 3,000 rads. Five of the ten patients had prior treatment with corticosteroids in high dosages with only partial or no response. All ten patients had clinical resolution of the lymphoid hyperplasia orbital mass within three weeks following radiation therapy. A follow-up period of six months to five years has demonstrated no recurrences. There were no discernible complications from the radiation therapy. We believe that radiation therapy should be considered as a primary treatment of benign lymphoid hyperplasia of the orbit.