Sea potato may refer to :
- Colpomenia peregrina, a species of brown algae more commonly known as oyster thief or bladder weed
- Leathesia marina, formerly Leathesia difformis, another species of brown algae more commonly known as sea cauliflower
- Species of littoral sea urchins, especially heart urchins
- Echinocardium cordatum, a specific species of urchin, commonly known as common heart urchin.
- Echinocardium flavescens, called the yellow sea potato
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