New Berlin
- County:
- Waukesha County
- County Seat:
- No
- Area (mi²):
- 36.426
- State:
- Wisconsin
New Berlin is a city located in Waukesha County, Wisconsin. New Berlin has a 2026 population of 40,302. New Berlin is currently growing at a rate of 0.24% annually but its population has decreased by -0.38% since the most recent census, which recorded a population of 40,454 in 2020.