New Castle
- County:
- Henry County
- County Seat:
- Yes
- Area (mi²):
- 0.41
- State:
- Kentucky
New Castle is a city located in Henry County, Kentucky. New Castle has a 2026 population of 907. It is also the county seat of Henry County. New Castle is currently growing at a rate of 1.34% annually and its population has increased by 2.37% since the most recent census, which recorded a population of 886 in 2020.