Conus trigonus, common name the trigonal cone, 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.

The subspecies Conus trigonus adami Wils, 1988 is a synonym of Conus adami Wils, 1988

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