Nelson
- County:
- Lee County
- County Seat:
- No
- Area (mi²):
- 0.357
- State:
- Illinois
Nelson is a village located in Lee County, Illinois. Nelson has a 2026 population of 125. Nelson is currently declining at a rate of -0.79% annually and its population has decreased by -2.34% since the most recent census, which recorded a population of 128 in 2020.