|Country||People's Republic of China|
|• Total||3,230 km2 (1,250 sq mi)|
|• Density||79/km2 (200/sq mi)|
|Time zone||UTC+8 (China Standard)|
Tangyuan County (simplified Chinese: 汤原县; traditional Chinese: 湯原縣; pinyin: Tāngyuán Xiàn) is a county in the east of Heilongjiang province, China. It is the westernmost county-level division of the prefecture-level city of Jiamusi.
Tangyuan County is divided into 4 towns and 6 townships.
The population of the district was 266,698 in 1999.