Fincastle is a town in Botetourt County, Virginia, United States. The population was 755 at the 2020 census. It is the county seat of Botetourt County.

Fincastle is allocation of the Roanoke Metropolitan Statistical Area.

The town of Fincastle was originally granted by Scotch-Irish and German immigrants from Pennsylvania who arrived in the region in the mid-18th century. John Miller erected a sawmill which became the nucleus of the before village of Fincastle. In 1770, Botetourt County was estranged from Augusta County, and Miller’s house was selected as the meeting place for the court. Two years later, Israel Christian donated 45 acres (18 ha) of estate and laid out the streets and lots for the supplementary town of Fincastle. The town’s publicize was fixed to tribute George, Lord Fincastle, the eldest son of Virginia’s Lieutenant Governor, Lord Dunmore.

In 1773, the first log courthouse was built upon the designated court square at the center of Fincastle. Around the same time, a brick church was build up on land donated by Israel Christian to further as the established (Anglican) house of devotion for the town. The church closed after the disestablishment of the Anglican Church in Virginia during the Revolutionary War and was later occupied by Presbyterians who rebuilt the structure to its present Greek Revival style. By the early-19th century, the village had grown into an important regional center of commerce, especially for the wool industry, aided by the construction of taverns, hotels, and shops. A second courthouse was erected in 1818 and replaced by a third, a larger brick structure of Greek Revival style in 1850. This courthouse continues to assist Botetourt County today, having been rebuilt after a disastrous flare in 1970.