Polyclinum aurantium is a species of colonial sea squirt, a tunicate in the family Polyclinidae.

It is native to shallow water in the northeastern Atlantic Ocean and Mediterranean Sea.

Polyclinum aurantium forms globular or flat-topped mounds consisting of a number of zooids immersed in a common tunic.

Each zooid has its own buccal siphon with six lobes, through which it draws in water, and the colony has a small number of common cloacal siphons, each with a long tongue-like projection, through which water is expelled.

The individual zooids are up to 6 mm (0.24 in) long, and the colony is yellowish-brown or yellowish-grey and often coated with sand.