Western Guo (Chinese: 西虢; pinyin: Xī Guó) was a vassal state in China during the Zhou dynasty.

After King Wu of Zhou destroyed the Shang dynasty in 1046 BCE, his uncle Guo Shu received grants of land at Yong.

The rulers of Western Guo held administrative positions in the court of the Zhou Kings through successive generations.

[1] Due to harassment and invasion by the Quanrong tribes Western Guo moved eastwards, eventually migrating to Sanmenxia[C] in the Yellow River valley between Xi'an and Luoyang.

Afterwards some of the nobility along with a number of civilians were captured by the Jin Army and taken to the area of what is now Fenyang, Shanxi Province where they became a prominent family with the name Guo.