- Language: Chiwere
- Alternate names: Oto, Iowa-Oto
- Language code: iow
- Language family: Siouan-Catawban, Siouan, Mississippi Valley-Ohio Valley Siouan, Mississippi Valley Siouan, Chiwere-Winnebago (SIL classification)
- Number of speakers:
- Vulnerability: Awakening
Last fluent speakers of Iowa and Oto died in 1996. Others have some knowledge of the language (1997 J. GoodTracks). Iowa and Oto were 1 language, with some family variations cross-cutting tribal affiliations. Missouri dialect has been extinct for many years. Language preservation activities taking place in Oklahoma.
Chiwere dialects: Otoe-Missouria (Jiwere) is the dialect of the Otoe-Missouria Tribe. Iowa (Baxoje) is the dialect of the Iowa Tribe.