The prevalence of osteoporosis was increased. Bisphosphonates are effective medications for osteoporosis because these are increasing bone mineral density and lowering the risk of fractures. Recently, bisphosphonate associated osteonecrosis of the jaws has been well documented. Most reports relate to complications resulting from intravenous bisphosphonate therapy. Oral bisphosphonates have a good safety profile in the treatment of osteoprosis. A few cases were reported about oral bisphosphonates associated osteonecrosis, and we could not find Korean case in literatures. The aim of this repot is to present a Korean women case of osteonecrosis of the jaw associated with oral bisphosphonate treatment for osteoprosis. (J Korean Acad Fam Med 2008;29:520-524)