Ouachita
- Etheostomatinae
- Eurycea subfluvicola
- Fallicambarus harpi
- Fallicambarus tenuis
- Faxonella creaseri
- Lake Ouachita
- Obovaria arkansasensis
- Ouachita Baptist University
- Ouachita City, Louisiana
- Ouachita County, Arkansas
- Ouachita Electric Cooperative
- Ouachita Hills College
- Ouachita Mountains
- Ouachita National Forest
- Ouachita National Recreation Trail
- Ouachita Parish, Louisiana
- Ouachita Railroad
- Ouachita River
- Ouachita dusky salamander
- Ouachita madtom
- Ouachita map turtle
- Ouachita orogeny
- Ouachita pebblesnail
- Ouachita people
- Ouachita rock pocketbook
- Ouachita shiner
- Ouachita, Arkansas
- Percina brucethompsoni
- Washita (disambiguation)
- Wichita (disambiguation)