EWI may refer to:
EWI (an acronym for electric wind instrument, pronounced EE-wee) is the name of a wind controller, an electronic musical instrument invented by Nyle Steiner. The early models consisted of two parts: a wind controller and a synthesizer in a rackmount box. One of the current models from Akai, the EWI4000S, combines the two parts into one, placing the synthesizer in the lower section of the controller. It uses the Boehm fingering system and is designed to be similar in action to a soprano saxophone, although players familiar with the clarinet should have no problem adjusting to the fingering; the EWI instruments can also be played with a simpler fingering system that recorder players can play with very little adjustment. Modern instruments also can be switched to flute, oboe, and saxophone fingering modes. The EWI4000s and EWI USB also have a special EVI (acronym for electronic valve instrument) fingering mode that allows brass players to play the EWI. Similar to a soprano sax or clarinet, it is straight with a slight curve just below the mouthpiece, and is held in front of the body with a neck strap. Available models include the EWI3000, EWI3020, EWI4000s, EWI5000, and the EWI USB. There are also homemade and experimental EWIs with different designs.