Kilsyth is an unincorporated community in Fayette County, West Virginia, United States. Kilsyth is west-southwest of Mount Hope.
The community's name is a transfer from Kilsyth, in Scotland. Kilsyth had a post office, which opened on May 3, 1902, and closed on July 23, 2005. Kilsyth was incorporated in 1903.