Shell may refer to:

• Animal shell, such as that of a mollusk or turtle, egg, or a plant's nut
• Electron shell, describing the structure of electron configuration in atoms
• Shell (computing), a type of computer user interface (for example a Unix or a DOS shell)
• Shell (projectile), a projectile shot from a gun or artillery
• Shell sort, a sorting algorithm
• Racing shell, a rowed watercraft
• Royal Dutch Shell (and/or its subsidiary Shell Oil Company), the world's largest energy corporation
• Electron shells in atomic physics
• On shell and off shell, quantum field theory
• Art Shell, an American Football coach
• Big Shell, an offshore decontamination facilty in the videogame Sons of Liberty
• Shell Canada, a Canadian oil company
• Shell Thropp, a character from revisionist Gregory Maguire's books Wicked and Son of a Witch. His role is larger in the latter book.
• Shell (theater)

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