Panulirus polyphagus, the mud spiny lobster, is a species of crustacean that lives on shallow rocky reefs and muddy substrates in the tropical Indo-Pacific region.

The antennal plate bears two large spines and there are no transverse grooves on the abdominal segments.

In Europe, the otherwise similar native species, the north eastern Atlantic spiny crawfish (Panulirus regius), has four large spines on the antennal plate, and smooth grooves on the abdominal segments.

Its range extends from India and Pakistan, through the Philippines and Indonesia to northwestern Australia and southeastern New Guinea.

It is harvested in India in the Mumbai region and the northwest between November and March, but seems to be overexploited as catches are declining in size.