Ascandra contorta is a species of calcareous sponge belonging to the family Clathrinidae.

This is a whitish sponge which appears as a mass of irregular, convoluted tubes.

When viewed microscopically, the spicule structure of the two species is very different, A. contorta possessing two-pointed diactines and four-pointed tetractines as well as the three-pointed triactines which C. clathrus is exclusively made up of.

This sponge is found on north-eastern Atlantic coasts from the Arctic to the Mediterranean, usually on rocks at depths of 10–30 m, but occasionally in shallower water.

This article about a calcareous sponge is a stub.