For most of the General Agreement on Tariffs and Trade (GATT) 1947 era, the use of anti-dumping duties was typically limited to a small circle of developed countries. However, starting with the final years of the GATT 1947 era and especially in the WTO era, there has been a considerable expansion in the use of anti-dumping measures in general, and especially by developing countries. Today, developing countries represent the majority of both users and targets of anti-dumping measures. Like developed country users, developing countries have imposed many measures against exporters from other developing countries. The article discusses these trends and the underlying detailed statistics. The article concludes that anti-dumping policy is an integral part of the modern international trade policy landscape, and that the significant and increasing involvement of developing countries both as users and targets gives rise to an increased need for technical capacity on their part.