A case of eosinophilic granuloma in an unusual location (ischium) is presented. Eosinophilic granuloma, a benign lesion of bone, has many radiographic appearances that vary with location. The flat bone of the skull and pelvis are common sites of involvement. Although the iliac wings and pubic rami are not uncommon sites for such a lesion, the ischium is a rare site. This occurrence prompted us to report this case.