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The term filter may refer to:

• A device to separate mixtures. See filter (chemistry), filter (water), filter (air), pneumatic filter.
• A device to remove or block certain wavelengths (colors) of light. See filter (optics), filter (photography), infrared filter
• A computer program to process a data stream. See filter (software), filter (Unix), mail filter, printer filter, Internet filter, lameness filter.
• An electronic or mechanical device, or mathematical algorithm, for affecting the harmonic content of signals. See electronic filter, signal processing, audio filter.
• In mathematics, a certain kind of subset of a partially ordered set. See filter (mathematics)

See also

• Filtration
• Affective filter, a type of learning blockage.
• Conversion
• Filter coffee, a hot drink
• Filter feeder, an animal that strains food particles from water
• Filter (band), a 1990s industrial rock band
• Filter (television), a show on the G4 channel
• Filter (magazine), an off-beat indie music magazine
• Philter, a magical charm

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