Biru County (Tibetan: འབྲི་རུ་རྫོང་།; Chinese: 比如县) is the most populated county within Nagqu of the Tibet Autonomous Region, China.

Either of the following pronunciations can be considered correct in Standard Tibetan: [bìru] ~ [pìru] (conventionally written Biru in English) or [ɖìru] ~ [ʈìru] (conventionally Driru).

Biru lies in the southwest part of the former province of Kham.

Diru is bordered by Sog County to the northwest and the extreme east of Banbar County་, is also surrounded by Lhari County to the south, and extreme north to the Nagchu county.

Biru county contains the following 2 towns and 8 townships: At the 2009 PRC census, the county's population was 60,179, of whom: This Nagqu Prefecture, Tibet location article is a stub.