Sanjia could refer to the following places in China:
Towns Sanjia, Yangchun (三甲镇), Guangdong Sanjia, Dongfang, Hainan (三家镇) Sanjia, Gaoping (三甲镇), Shanxi Sanjia, Suining (三家镇), in Anju District, Suining, Sichuan
Townships Sanjia (三家乡) in Hebei's Chengde County Sanjia (三佳乡) in Shanxi's Jiexiu Prefecture
Subdistrict Sanjia, Leiyang (三架街道), a subdistrict of Leiyang City, Hunan.