Acadiocaris is an extinct genus of malacostracan crustacean that existed in Canada during the Early Carboniferous.

[1] Analysis of fossils shows that Acadiocaris retained a number of primitive morphological features compared to more modern spelaeogriphaceans: an optic notch was not developed under its rectangular carapace; thoracopodal endopods were elongated, and five pairs of well-developed but relatively small and simple pleopods.

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