The Western Java montane rain forests ecoregion (WWF ID: IM0167) covers the montane rain forest above 1,000 meters in the volcanic mountain ridges in the west of the island of Java in Indonesia.

Several mammals and bird species are found only in this ecoregion, including the Javan mastiff bat (Otomops formosus) and the Volcano mouse (Mus vulcani).

[2][3][1][4] The ecoregion stretches 500 km from west to east across western and central Java.

[1] The evergreen forest includes Artocarpus elasticus, yellow mahogany (Epicharis parasitica), langsat (Lansium parasiticum), and Planchonia valida.

[4] At higher elevations, characteristic species are heath (family Ericaceae) such as Rhododendron.