Lannon
- County:
- Waukesha County
- County Seat:
- No
- Area (mi²):
- 2.472
- State:
- Wisconsin
Lannon is a village located in Waukesha County, Wisconsin. Lannon has a 2026 population of 2,048. Lannon is currently growing at a rate of 3.33% annually and its population has increased by 44.33% since the most recent census, which recorded a population of 1,419 in 2020.