- Any of several grasses of the genusAlopecurus, having dense, silky or bristly flowering spikes. 狐尾草：看麦娘属 草的一种，有浓密的，光滑或多硬毛的花穗
- iotacism
- iotacisms
- iotas
- IOU
- IOUs
- -ious
- Iowa
- Iowa Central Community College
- Iowa City
- Iowa Lakes Community College-Estherville
- Iowa Lakes Community College-South
- Iowa River
- Iowas
- Iowa State University
- Iowa Wesleyan College
- Iowa Western Community College
- Iowa Western Community College-Clarinda
- Ioway
- IP
- IPA
- IPAs
- Ipatieff
- ipecac
- ipecacs
- ipecacuanha