Trigonopterus diengensis is a species of flightless weevil in the genus Trigonopterus from Indonesia.[1]
The specific name is derived from that of the type locality.
Individuals measure 1.92–2.36 mm in length. The body is slightly oval in shape. General coloration is black, with rust-colored legs and antennae.
The species is found around elevations of 1115m (3,658feet) on the Dieng Plateau in the Indonesian province of Central Java.