The Dreta (pronounced [ˈdɾeːta]) is a river in Styria, northeastern Slovenia.

It flows through the town of Gornji Grad, Bočna, and Šmartno ob Dreti, and merges with the Savinja River in Nazarje.

The Dreta Valley (Slovene: Zadrečka dolina) is named after the river.

The origin of the name is uncertain, but is likely connected with the Croatian hydronym Dretulja and the Slovak hydronym and place name Drietoma.

This article related to a river in Slovenia is a stub.