Haliclona stilensis, the encrusting turret sponge, is a species of demosponge.

[2] Haliclona stilensis grows to about 1 cm thick.

It is a thinly encrusting sponge which is highly variable in both shape and colour.

[2] This sponge lives from the subtidal zone and down to at least 15m underwater.

It may encrust mussels or other hard surfaces or be found under stones in sheltered to moderately exposed areas.