Fencheng County was a county located in the southwest of Shanxi Province, China. It served as one of the constituent administrative divisions that were merged to form the current Xiangfen County.
In February 1954, Fencheng County was merged with the former Xiangling County to establish Xiangfen County. The resulting county currently falls under the jurisdiction of the prefecture-level city of Linfen and covers an area of 1,034 km2.