Casing may refer to an enclosing shell, tube, or surrounding material. It may also refer to:

• Cartridge (firearms), shell enclosing the explosive propellant in ammunition
• Casing (borehole), metal tube used during the drilling of a well
• Casing (molding), decorative molding surrounding door or window openings
• Casing (sausage), thin covering holding the food contents of sausage
• Casing (submarine), platform attached to the upper side of a submersible vehicle
• Computer case, the enclosure that contains most of the components of a computer
• Letter case, the distinction between upper and lowercase letters in typography
• Surreptitious reconnaissance, especially to aid a robbery

• All pages with titles beginning with Casing
• All pages with titles containing Casing
• Cas (disambiguation), French for "case"
• Case (disambiguation)
• Casting (disambiguation)
• Cover (disambiguation)
• Sleeve (disambiguation)
• KaSing, or Raymond Tsang, (born 1995) Hong Kong League of Legends player