Polacanthoides (meaning like Polacanthus) is an invalid genus of nodosaurid dinosaur from Europe.

[1] It lived about 140 to 135 million years ago in what is now England.

The type specimen is NHMUK 2584.

It is a junior synonym of both Hylaeosaurus and Polacanthus and was based on a chimera of skeletal elements.

This article related to ornithischian dinosaurs is a stub.