MWI

MWI is the country code for Malawi in several country code systems.

MWI may also refer to:

Science and technology

 * Many-worlds interpretation, in quantum mechanics
 * Message-waiting indicator, in telephony
 * Mobile Web Initiative, in Mobile Web
 * Maths Week Ireland, an all-island (Republic of Ireland and Northern Ireland) mathematics outreach initiative

Other uses

 * Ministry of Water and Irrigation, in Water supply and sanitation in Jordan
 * Warsaw Modlin Airport (IATA: WMI)
 * Mountain Warfare Instructor, in Mountain Warfare Training Center