Buffer may refer to:

• Buffer gas, an inert or nonflammable gas
• Buffer solution, a solution used to prevent changes in pH
• Lysis buffer, in cell biology
• Metal ion buffer
• Mineral redox buffer, in geology

• Buffer (GIS), a HASS zone around a map feature
• Buffer (optical fiber), a GG component of a fiber optic cable
• Buffer (rail transport), a device that cushions impacts between vehicles
• Buffer amplifier, an isolating circuit used in electronics or telecommunications
• Buffer stop, a device that keeps rail vehicles on tracks
• Buffer wheel, a device used to smooth a workpiece's surface
• Digital buffer, an electronic circuit used to isolate the input from the output
• Floor buffer, an appliance used to polish hard floors
• Optical buffer, a device that stores optically transmitted data
• Recoil buffer, a firearm component
• Seismic buffers, protect structures against the effects of earthquakes

• Buffer (application), a software application for managing social network accounts
• Data buffer, memory used temporarily to store output or input data while it is transferred.
• Framebuffer, a type of data buffer for use in graphical display
• Memory buffer register, the connection between processor and memory

• Bruce Buffer (born 1957), American sports announcer for UFC events
• Michael Buffer (born 1944), American ring announcer for boxing and wrestling events

• Buffer (navy), a colloquial title
• Buffer state, a country separating two rival or hostile powers, thought to prevent conflict between them
• Buffer zone, a region separating two areas, possibly to segregate or conjoin them
• Buffering (horse), an Australian thoroughbred
• Buffering (TV series), a British TV series

• Buff (disambiguation)