Heterochelus promontorii is a species of beetle of the family Scarabaeidae. It is found in South Africa (Western Cape).
Adults reach a length of about . Males are black, with the elytra chestnut-red or dark bronze. The scutellum, the propygidium, and the abdomen are clothed with dense yellowish scales, but the pygidium is glabrous and shining, and the elytra have a sutural band of similar scales beginning at about the median part and continued on the apical, and a discoidal one reaching from the base to the middle. Females are similar to males, but the scales on the elytra are replaced by inconspicuous, sub-squamose hairs.