Conus marmoreus, common name the marbled cone, is a species of predatory sea snail, a marine gastropod mollusk in the family Conidae, the cone snails, cone shells or cones. It is the type species for the genus Conus, which is the type genus of the family. This is a species which is believed to feed mostly on marine mollusks including other cone snails. This snail is venomous, like all cone snails.

The subspecies: Conus marmoreus bandanus Hwass in Bruguière, 1792 is a synonym of Conus bandanus Hwass in Bruguière, 1792

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