Polybothris sumptuosa, the Malagasy jewel beetle, is a species of beetle in the family Buprestidae.

Polybothris sumptuosa can reach a length of about 35–38 millimetres (1.4–1.5 in).

This jewel beetle shows various chromatic forms.

There are a shiny metallic blue form (P. sumptuosa gemma), a dark green form (P. sumptuosa superba) and a dark green to black form (P. sumptuosa sumptuosa).

These wood boring beetles can be found in Madagascar.