A bubble may refer to:

• a pocket of air or gas caught within a solid or liquid
• a spherical liquid film (often of surfactant, occasionally of bubble gum) filled with air or gas
• a metaphor for isolation (e.g. 'living in a bubble')
• a (normally) transparent dome
• a metaphor for an unsound investment opportunity which may leave investors penniless when it "bursts", for example the South Sea bubble and Tulip Mania.
• a light bulb of any type, in the theatre.

See also: soap bubble, bubble (economics), antibubble, Westminster Bubble, bubble and squeak