Xiaojin County (Chinese: 小金县), also known as Tsanlha from its Tibetan name (Tibetan: བཙན་ལྷ་རྫོང་།), is a county in the northwest of Sichuan Province, China.

It is the southernmost county-level division of the Ngawa Tibetan and Qiang Autonomous Prefecture.

Prior to the 18th century, Lesser Jinchuan was ruled by the Gyalrong Tibetan Chiefdom of Tsanlha.

From 1747 to 1776, the Qing dynasty launched the Jinchuan campaigns to suppress the Jinchuan chiefdoms.

Xiaojin County contains 7 towns and 11 townships: This Sichuan location article is a stub.