Condenser may refer to:
- Condenser (heat transfer), a device or unit used to condense vapor into liquid. More specific articles on some types include:
- Condenser (laboratory), a range of laboratory glassware used to remove heat from fluids.
- Surface condenser, a heat exchanger installed in steam-electric power stations to condense turbine exhaust steam into water.
- Air coil used in HVAC refrigeration systems.
- Condenser (optics), in classical optics for the visible spectrum, a mirror, lens, or combination of mirrors and lenses used for the purpose of gathering visible light and directing it onto some object or through a projection lens, such as in Köhler illumination, telescope, projector, or enlarger
- Condenser (microscope), a group of lenses mounted below the stage of an optical microscope to concentrate light.
- Capacitor, formerly called a condenser, an electrical device that can store energy.
- Condenser microphone, a device that converts sound waves into an electrical signal.
- Steam locomotive condensing apparatus, a condenser fitted to steam locomotives for use in tunnels and to increase range.
- Synchronous condenser, a rotating machine similar to a motor, used to control AC power flow in electric power transmission.