Capsule may refer to:

• Articular capsule (joint capsule), an envelope surrounding a synovial joint
• Bacterial capsule, a layer that lies outside the cell wall of bacteria
• Bowman's capsule (glomerular capsule), a sac surrounding a glomerulus in a mammalian kidney
• Capsular contracture, the scar tissue naturally forming around breast implants
• Capsule (fruit), or seed capsule, a type of dry fruit like the poppy, iris or foxglove
• Capsule (pharmacy), a small gelatinous case enclosing a dose of medication
• Glisson's capsule, a fibrous layer covering the external surface of the liver
• Lymph node capsule
• Renal capsule, a tough fibrous layer surrounding the kidney
• Yeast capsule, a layer surrounding some pathogenic yeasts

• External capsule
• Extreme capsule
• Internal capsule

• Capsule (band), a Japanese electronic duo
• Capsule (CRM), a Customer Relationship Management SaaS web application and mobile app
• Capsule (Ferris wheel), a passenger compartment
• Capsule (geometry), a shape consisting of a cylinder capped with hemispheres
• Capsule hotel, a type of very dense overnight lodging popular in urban Japan
• Capsule (microphone), the component which converts acoustic energy into an electric signal
• Capsule neural network, a type of artificial neural network
• Capsule review, short critique
• Capsule (website), an event-sharing social platform
• Space capsule, a type of crewed spacecraft
• The Capsule, a 2012 Greek short film
• Time capsule, a cache of items and/or information to be preserved for future times

• Encapsulation (disambiguation)