Chiang Si-qian (Chinese: 蒋斯千; 1814–1894) is the grandfather of former Republic of China President Chiang Kai-shek.
Chiang Si-qian was born during the Qing Dynasty in 1814 to Chiang Qi-zeng (蒋祈增). His early years were spent as a farmer and later years were spent in Xikou, Fenghua in Zhejiang Province in a village named Jinxi (锦溪村) managing the Yutai salt store as well as making and selling wine. His business became more successful later on and improved the Chiang families social status. Chiang Si-qian raised two children. His eldest son was named Chiang Zhao-hai and the second son called Chiang Zhao-cong who was Chiang Kai-shek's father. Chiang Si-qian died in 1894.