Trochalus rosettae is a species of beetle of the family Scarabaeidae. It is found in Cameroon.
Adults reach a length of about 8-8.5 mm. The upper surface is blackish-brown to dark reddish-brown, dull and tomentose. The frons is glossy and the pygidium is dull. The pronotum has a few scattered hairs on the anterior margin and the ventral segments have very scattered setae. The lateral margins of the elytra are finely, loosely, and pale-ciliate, but the rest is glabrous. The antennae are brown, with a yellow club.