Leopoldamys diwangkarai is a large long-tailed rat described from Kalimantan and Java, Indonesia. Its 2008 original description reports specimen features and the forest settings where they were collected.
The back is reddish brown and the underside is white to cream. Kalimantan specimens have dark-gray underfur, while the Java specimen was duller overall. Dark stripes are reported on the upper surfaces of the feet.
The original description records collection sites in lowland primary forest in Kalimantan and montane forest in Java. It describes these as restricted forest settings but does not detail diet or daily behavior.
An extinction-risk assessment has not been added yet.