Cryptocephalus sarawacensis is a species of leaf beetle in the genus Cryptocephalus found in Singapore and Borneo.
This species is an overall a dark brown sienna color that gradually lightens as the abdomen gets thinner towards the back. The beetle looks overall like a cross between a leaf beetle and a scarab beetle, which is most noted in the little diamond in its joiner. It also has two eyespots that are square like with small peppering around it.