Selaserica knucklensis is a species of beetle of the family Scarabaeidae. It is found in Sri Lanka.
Adults reach a length of about 9.4 mm. They have a reddish brown, oblong body, with yellowish brown antennae. The dorsal surface is shiny and nearly glabrous, except for some long, fine setae on the elytra.
The species is named for its type locality, the Knuckles Mountain Range.