WMI may refer to:
Organisations Washington Mutual Inc, a former savings bank holding company Waste Management, Inc (former NYSE symbol), a provider of waste management services Water Missions International, an engineering organization providing safe water and sanitation following natural disasters West Michigan Railroad (reporting mark) Former World Medicine Institute, Honolulu, Hawaii, US, previously Tai Hsuan Foundation College of Acupuncture & Herbal Medicine
Other Windows Management Instrumentation, Microsoft extensions to the Windows Driver Model WMI (window manager), later wmii, Window Manager Improved, for X Window System World manufacturer identifier in a Vehicle Identification Number Working Memory Index, part of the Wechsler Intelligence Scale for Children Warsaw Modlin Airport, Poland, IATA code