Octopus sinensis (commonly known as the East Asian common octopus) is a mollusk belonging to the class Cephalopoda. Octopus sinensis is a shallow-water species found in coastal temperate waters of Japan, South Korea, and China, with the species name, sinensis being Latin for "Chinese". Octopus sinensis is closely related to the Atlantic and Mediterranean common octopus, Octopus vulgaris, another octopus inhabiting the benthic zone; the two are so morphologically similar that O. sinensis was considered a population of Octopus vulgaris until 2017. Octopus sinensis are carnivores that prey upon on many shallow-water animals such as crustaceans and mollusks.

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