Augst (Swiss German: Augscht) is a municipality in the district of Liestal in the canton of Basel-Country in Switzerland . It was known as Augusta Raurica in Roman times.

Augst is first mentioned in 615 as Augustodunensem praesulem. In 752 it was mentioned as Augusta and in 1288 as Augst.

Augst has an area, as of 2009, of 1.64 square kilometers (0.63 sq mi). Of this area, 0.57 km2 (0.22 sq mi) or 34.8% is used for agricultural purposes, while 0.11 km2 (0.042 sq mi) or 6.7% is forested.