Trigonopterus dimorphus is a species of flightless weevil in the genus Trigonopterus from Indonesia.

[1] The specific name is derived from di-, a prefix meaning "two", and the Greek word morphe, meaning gestalt.

[1] Individuals measure 2.94–3.80 mm in length.

General coloration is black, except for the antennae, tarsi, and tibiae, which are rust-colored.

[1] The species is found around elevations of 1,000–1,200 metres (3,300–3,900 ft) in Mount Halimun Salak National Park in the Indonesian province of West Java.