Pachygrapsus is a genus of small shore crabs. Recent genetic data suggest this genus to be possibly polyphyletic.

It comprises the following species:

• Pachygrapsus corrugatus (von Martens, 1872)
• Pachygrapsus crassipes Randall, 1840
• Pachygrapsus fakaravensis Rathbun, 1907
• Pachygrapsus gracilis (Saussure, 1858)
• Pachygrapsus laevimanus Stimpson, 1858
• Pachygrapsus loveridgei Chace, 1966
• Pachygrapsus marmoratus (Fabricius, 1787)
• Pachygrapsus maurus (Lucas, 1846)
• Pachygrapsus minutus A. Milne-Edwards, 1873
• Pachygrapsus planifrons De Man, 1888
• Pachygrapsus plicatus (H. Milne-Edwards, 1837)
• Pachygrapsus propinquus De Man, 1908
• Pachygrapsus socius Stimpson, 1871
• Pachygrapsus transversus (Gibbes, 1850)

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