Shell may refer to
* Animal shell, or exoskeleton, including those of molluscs, turtles, insects and crustaceans
* Seashell, the shells of various marine animals, especially marine mollusks
* Eggshell, the outer covering of a hard-shelled egg

Any more or less hollow surface covering, including:
* Shell (projectile), a projectile which carries an explosive payload
* Shell (theater), a curved surface for reflecting and focusing sound
* Racing shell, a rowed watercraft
* Thin-shell structure, a method of building construction

In science and mathematics:
* Shell (mathematics), a ring-like algebraic structure
* Electron shell, describing the structure of electron configuration in atoms
* Electron shells in atomic physics
* On shell and off shell, in quantum field theory

In computing
* Shell (computing), a type of computer user interface (for example a Unix or a DOS shell)
* Shell account, a personal account that gives a user access to a Unix shell on another machine, usually through SSH
* Shell sort, a sorting algorithm

In business
* Royal Dutch Shell, a multinational energy company
** Shell Oil Company, American affiliate
** Shell Canada
** Shell Nigeria
** Showa Shell Sekiyu K.K., in Japan.
* Shell Turbo Chargers, a defunct basketball team in the Philippines under the ownership of the Shell Corporation.

* Shell, Ecuador, sometimes called Shell Mera, a city named after the Shell Oil Company

* Shell (corporation)

In media and entertainment:
* Shell Thropp, a character from the books "Wicked" and "Son of a Witch"
* "Shells" ("Angel"), a 2004 episode of the television series "Angel"
* The Shells, an American doo wop group
* Big Shell, an offshore decontamination facility in the videogame "Metal Gear Solid 2: Sons of Liberty"

As a surname:
*Donald Shell, American computer scientist
*Art Shell, former American football player and coach

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