加马什（法语：Gamaches）是法国皮卡第大区索姆省的一个市镇，属于阿布维尔区加马什县。该市镇2009年时的人口为2820人。

加马什人口变化图示

数据来源：INSEE

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

Gamaches is situated on the D1015, on the banks of the Bresle River, the border with Seine-Maritime, some 18 miles (29 km) southwest of Abbeville.
Huge lakes to the west of the town are a paradise for naturalists, anglers and water sports enthusiasts.