Wadena
- County:
- Fayette County
- County Seat:
- No
- Area (mi²):
- 0.752
- State:
- Iowa
Wadena is a city located in Fayette County, Iowa. Wadena has a 2026 population of 201. Wadena is currently declining at a rate of -1.47% annually and its population has decreased by -2.43% since the most recent census, which recorded a population of 206 in 2020.