Tailai County () is a county in the west of Heilongjiang province, People's Republic of China, bordering Inner Mongolia to the west and Jilin province to the south. It is the southernmost county-level division of the prefecture-level city of Qiqihar.
Tailai County is divided into 7 towns, 1 ethnic town and 2 ethnic townships.
The population of the district was in 1999.