Cancer is a genus of marine crabs, including familiar crabs of the littoral zone, such as the Dungeness crab and the edible crab.

Species

• Cancer amphioetus M. J. Rathbun, 1898
• Cancer antennarius Stimpson, 1856
• Cancer anthonyi M. J. Rathbun, 1897
• Cancer borealis Stimpson, 1859 — Jonah crab
• Cancer branneri M. J. Rathbun, 1926
• Cancer ellanius Linnaeus, 1758
• Cancer gracilis Dana, 1852
• Cancer irroratus Say, 1817
• Cancer jordani M. J. Rathbun, 1900
• Cancer macrophthalmus (M. J. Rathbun, 1906)
• Cancer magister Dana, 1852 — Dungeness crab
• Cancer novaezealandiae (Jacquinot, 1853) — pie crust crab
• Cancer oregonensis (Dana, 1852)
• Cancer pagurus Linnaeus, 1758 — edible crab
• Cancer productus J. W. Randall, 1840 — red rock crab
• Cancer setosus
• †Cancer starri Berglund & Goedert, 1996