Zijin County (Chinese Postal Map Romanisation spelling: Tzekam; Chinese: 紫金縣; Hakka Pha̍k-fa-sṳ: Tsṳ́-kîm-yen) is a county of Guangdong Province, China. It is under the administration of Heyuan city. The county was known as Yongan County (Chinese Postal Map Romanisation: Wingon) before January 1914.