Unteriberg is a village and municipality in Schwyz District in the Canton of Schwyz in Switzerland . Besides the village of Unteriberg, the municipality includes the villages of Studen, Waag, Stöcken and Herti.

Unteriberg is first mentioned around 1217-22 as Yberge. Until the separation, in 1884, into Unteriberg and Oberiberg the independent municipality was known simply as Iberg.

Unteriberg is the hometown of noted ski racer Wendy Holdener.

The municipality of Unteriberg lies in the valleys of the Sihl, Waag and Minster rivers, at the southern end of the artificial Sihlsee .