New Castle is a town in the U.S. state of Virginia. It is the only incorporated town in Craig County and serves as that county's seat.
The town is located in the mountainous western portion of Virginia, within the Craig County area of the state's Appalachian region. As county seat, it hosts the county's administrative offices and courthouse.
New Castle is a very small community. According to the 2020 census, its population was 125, making it one of the least populous county seats in Virginia.