Extender may refer to:
- Ascender or descender, in typography and graphonomics
- DOS extender, a technology for bypassing the limitations of the DOS operating systems family
- KC-10 Extender, an air-to-air tanker aircraft
- Meat extenders
- Media extender
- Surimi, known as seafood extender
- Tele extender, a secondary lens for SLR cameras