Rostanga crawfordi is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.

Originally described as Discodoris crawfordi, it was redescribed by Rudman & Avern as Rostanga australis.

[3] This dorid nudibranch is pale orange-yellow to orange-pink in colour; the dorsum is covered with caryophyllidia.

[2][4] Rostanga crawfordi is found on the red sponge, Psammoclema, on which it presumably feeds.

Most other species of Rostanga feed on sponges of the family Microcionidae.