The word capsule may refer to:

• A space capsule is a type of manned spacecraft.
• A small gelatinous case enclosing a dose of medication. See encapsulation (pharmacology)
• A time capsule is a cache of items and/or information to be preserved for future times.
• A protective cover for a cork on a bottle.
• A capsule hotel is a type of very dense overnight lodging popular in urban Japan.
• Capsule (fruit), a type of dry fruit like the poppy, iris or foxglove.
• Another name for the sporangium of mosses and hornworts.
• The scar tissue naturally forming around breast implants. See capsular contracture.
• Capsule (anatomy), a cover or envelope partly or wholly surrounding a structure.
• Capsule (microbiology), a layer that lies outside the cell wall of bacteria.