The article discusses the development of international groundwater law from the first codification efforts of modern water law until present and raises relevant issues for the way forward. It first traces international groundwater law from the 1960s until the end of the last century. It then reviews the growing attention groundwater has received during the last decade and third discusses the status quo. It places particular emphasis on the 2008 Draft Articles on the Law of Transboundary Aquifers adopted by the International Law Commission and the legal arrangements made for five of the 273 transboundary aquifers. It concludes with thoughts on the way forward in this important and understudied area of international law.