Balmain Bug (Ibacus peronii) refers to a Southeastern Australian common lobster species It is a type of sand lobster which can also be found in some parts of the north west but mainly off the eastern seaboard. Sand lobsters are any of a variety of small crustaceans bearing a resemblance to lobsters and which bury themselves in sand or mud during the day. Balmain Bug is not as popular as rock lobster, but it is available in Australia commercially.

Balmain Bug is also known as bug, flapjack, flying saucer, shovelnose lobster, slipper lobster, southern bay lobster, squagga