Expander

Expander may refer to:


 * Dynamic range compression operated in reverse
 * Part of the process of signal compression
 * Part of the process of companding
 * A component used to connect SCSI computer data storage, devices together
 * Turboexpander, a turbine for high-pressure gas
 * Expander graph, a sparse graph used in the combinatorics branch of mathematics
 * StuffIt Expander, a computer file decompressor software utility
 * Micro Expander, also known as the Expander, an 8-bit S-100 microcomputer released in 1981
 * "Expander" (song), a 1994 song by The Future Sound of London
 * Orthodontic expander, a device to widen the upper jaw
 * Disclosure widget, a widget that hides non-essential settings or information, also known as an expander