Jiazi () is a town in Qiongshan District of Haikou, Hainan, People's Republic of China, located more than southeast of downtown Haikou.
The town covers an area of and is located southeast of downtown Haikou bordering Dazhi () to the east, Ding'an County to the west and Penglai () to the south. , Jiazi is responsible for the administration of 14 villages.
The town received its name during the ninth year of the reign of the Qing Qianlong Emperor (1744), when a market began in the first year of the 60-year cycle, which is also called jiazi.