Platycesta is a genus of beetles belonging to the family Chrysomelidae. It is monotypic, the only species being Platycesta depressa.
Platycesta depressa occurs in Central and northwestern South America from Honduras to Peru. A record from the United States is considered erraneous. They feed on leaves of Cecropia.
Adults measure in length. The head, prothorax, and scutellar shield are yellow-brown to orange-brown. The antennae, tibiae, tarsi, and abdomen are black. However, the elytra are variable, ranging from entirely orange-brown to entirely black; the intermediate forms are basally pale and distally dark.