Conus gratacapii is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.

Like all species within the genus Conus, these snails are predatory and venomous. They are capable of stinging humans, therefore live ones should be handled carefully or not at all.

This species is named for Mr. L. P. Gratacap, of the American Museum of Natural History.

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