Sea Scorpion may refer to:
Scorpions are predatory arachnids of the order Scorpiones. They have eight legs and are easily recognized by the pair of grasping pedipalps and the narrow, segmented tail, often carried in a characteristic forward curve over the back, ending with a venomous stinger.
Eurypterids, also known as sea scorpions, are an extinct group of arthropods related to arachnids that include the largest known arthropods to have ever lived. Despite their colloquial name, only the earliest ones were marine (later ones lived in brackish or freshwater), and they were not true scorpions.