夸西（法语：Coisy）是法国皮卡第大区索姆省的一个市镇，属于亚眠区维莱博卡日县。该市镇2009年时的人口为286人。

夸西人口变化图示

数据来源：INSEE

Coisy is a commune in the Somme department in Picardie in northern France.

Coisy is situated on the D11a between the D11 and the N25, some 5 miles (8 km) north of Amiens.