Yabby is a name given in Australia to two different kinds of crustacean:

Cherax (freshwater yabby), a crayfish Trypaea (marine yabby), a ghost shrimp (infraorder Thalassinidea) which lives in the intertidal zone

See also Yabba (disambiguation) Yabby You (1946–2010), Jamaican reggae vocalist and producer