{{wiktionary|Ewi|ewi}} '''EWI''' may refer to:
* EastWest Institute, a former American think tank * Edison Welding Institute, nonprofit engineering and technology organization in Ohio, United States * Electronic wind instrument, an electronic musical instrument * The IATA code for Enarotali Airport, Central Papua, Indonesia * Expert Witness Institute, a nonprofit legal organization in Great Britain * External wall insulation, an insulated, protective, and decorative exterior cladding for buildings
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