Damper may mean:

• One that deadens, restrains, or depresses: Rain put a damper on our picnic plans.
• An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
• A device that eliminates or progressively diminishes vibrations or oscillations, as of a magnetic needle.

In Music:

• A device in various keyboard instruments for deadening the vibrations of the strings.
• A mute for various brass instruments.
• Damper (music), a device that mutes musical tones, particularly in stringed instruments such as the autoharp or piano

Other meanings:

• Damper (architecture), a mechnical device in a flue or chimney that regulates airflow
• Zone dampers are automated dampers used to control the flow of air in HVAC systems.
• Damper (mast), a device that damps oscillation in masts for better protection against storms
• Dashpot, a type of mechanical damper, a device which resists motion via viscous friction
• Shock absorber (British: damper), a mechanical device designed to smooth out or damp a sudden shock impulse and dissipate kinetic energy
• Tuned mass damper, a device mounted in structures to prevent discomfort, damage or outright structural failure by vibration

• Damper (food), a food of the Australian outback