IOW

IOW or iow may refer to:

Language

 * Chiwere language, a Siouan language of the United States with ISO 639-3 code.
 * Initialism of in other words.

Organisations

 * InsideOUT Writers, an American prison reform organisation
 * Leibniz Institute for Baltic Sea Research (Leibniz-Institut für Ostseeforschung Warnemünde)

Places

 * Isle of Wight, an island in the English channel
 * Iowa City Municipal Airport, Iowa, United States