Expander can refer to:
- Part of the process of dynamic range compression
- Part of the process of signal compression
- Part of the process of companding
- Turboexpander, a turbine for high-pressure gas
- Expander graph, a sparse graph used in the combinatorics branch of mathematics
- StuffIt Expander, a file decompressor software utility
- "Expander", a song on the album Accelerator 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.
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