Mud crab may refer to any crab that lives in or near mud, such as:

• Scylla serrata
• Scylla tranquebarica
• Scylla paramamosain
• Scylla olivacea
• Members of the family Panopeidae, such as Panopeus herbstii
• Members of the family Xanthidae
• Helice crassa, the tunnelling mud crab