IWR may be:
Interactive Web Response, similar to Interactive Voice Response (IVR) Intelligent word recognition Iraq Resolution or Iraq War Resolution, enacted by the United States in 2002 Information World Review, an information industry trade newspaper iShares Russell Midcap (ticker symbol IWR), an exchange-traded fund of U.S. stocks Institute for Water Resources, part of the United States Army Corps of Engineers Isle of Wight Railway In-water recompression, a treatment for decompression sickness Independent Wrestling Revolution, a company that promotes professional wrestling The Interdisciplinary Center for Scientific Computing (in German: Interdisziplinäres Zentrum für wissenschaftliches Rechnen, short IWR), a scientific research institute of the University of Heidelberg, Germany.