Ungaran (Dutch: Oengaran) is a town and adjacent areas in Central Java Province of Indonesia.

In the 19th century, defensive posts were established between Semarang and Surakarta to control the trade route between the two cities.

It lies at the northern end of a transverse chain of Java volcanoes extending north-north-west from Mount Merapi.

It was formed in three stages, with growth of the youngest edifice taking place during the late Pleistocene and Holocene eras.

The volcano is deeply eroded and no historical eruptions have been reported, but two active fumarole fields are located on its flanks.