Engi is a village, and former municipality, in the municipality of Glarus Süd and Canton of Glarus in Switzerland . The village lies in the valley of the Sernf river, and consists of the three adjacent village parts of Engi-Vorderdorf, Engi-Dörfli and Engi-Hinterdorf.

Engi is first mentioned in 1350 as ze engi.

From the 16th century, slate mining took place on the Landesplattenberg, overlooking the left bank of Sernf river, which provided slates for roofs, floors and stoves, and later for use in schools. From 1602 the trade was sufficient to support an export tax, and exports to northern and western Europe peaked in the 17th century. The operation declined in the following years, before again increasing with the construction of the first road up the valley in 1826.