IOW or iow may refer to:
Language
- Chiwere language, a Siouan language of the United States with ISO 639-3 code
iow
. - Initialism of in other words.
Organisations
- InsideOUT Writers, an American prison reform organisation
- Leibniz Institute for Baltic Sea Research (German: Leibniz-Institut für Ostseeforschung Warnemünde)
Places
- Isle of Wight, an island in the English channel
- Iowa City Municipal Airport, Iowa, United States
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