The World Trade Organization (WTO) Agreement does not contain a definition for a safeguard measure, nor does it prescribe the particular form that such a measure has to take. Recent dispute settlement reports have explored some aspects of this issue. Two conclusions reached in those reports are explained in this article. First, a WTO safeguard measure is one that is adopted following WTO and/or domestic rules and procedures on safeguard measures. A measure adopted pursuant to a provision of the General Agreement on Tariffs and Trade 1994 (GATT 1994) other than its Article XIX or pursuant to a WTO Agreement other than the Agreement on Safeguards (SG Agreement) may not be considered a WTO safeguard measure. Second, a WTO safeguard measure withdraws or modifies a tariff concession or suspends another GATT obligation. A measure that lacks these constitutive elements of a safeguard measure may not be considered a WTO safeguard measure.