Oocorys grandis is a species of large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet snails and bonnet snails.

[2] The length of the shell attains 103 mm.

The color of the shell is a baige white with the inside having a dark orange color The holotype was found in the Central Indian Ocean at depths between 2953 m and 4660 m.

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