may refer to:
- Animal Shell , such as that of a mollusk or turtle, Egg (biology) , or a Nut (fruit) in plants,
- Electron Shell , describing the structure of electron configuration in atoms
- Shell (computing) , a type of computer user interface (for example Unix Shell or DOS Shell )
- Shell (projectile) , shot from a gun
- Shell Sort , a sorting algorithm
- Racing Shell , a rowed watercraft
- Royal Dutch Shell , and its subsidiary Shell Oil Company
- Electron Shells In Atomic Physics
- On Shell And Off Shell in quantum field theory
- Art Shell , an American Football coach
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