Flex

Flex may refer to:
* Flexible electrical cable

In computing

*Adobe Flex, technologies for developing rich internet applications
*Flex, a family of automatic test equipment produced by Teradyne
*Flex lexical analyser, a free software alternative to Lex
*Flex machine, multiple systems
*FLEX (operating system), a single-tasking operating system for the Motorola 6800
*FLEX (protocol), a communication protocol for pagers

In modern culture

*Nigga, Félix Danilo Gómez, Panamanian reggaeton singer, alternatively named "Flex"
*Flex Alexander, Mark Akexabder Knox (b. 1970), an American actor and comedian
*Flex (club), a nightclub in Vienna
*Flex (comics), a fictional superhero
* "FLEX" (magazine), an American bodybuilding magazine
*Flex (Pitch Black EP)
*Funkmaster Flex, Aston George Taylo Jr (b. 1968), an American hip hop DJ

In science and technology

*Femtosecond Lenticule EXtraction, a form of refractive eye surgery
*Flex-Elektrowerkzeuge, a German producer of power tools
*Flex-fuel, a Flexible-fuel vehicle
*FLEX mission, a potential satellite launch mission by the European Space Agency
*Flextronics (NASDAQ symbo: FLEX), a contract electronics maker in Singapore
*Ford Flex, a full sized people mover vehicle
*Frequency Level Expander, a Pioneer Corporation tape enhancement feature

In other uses
*Flexible spending account, a tax-advantaged savings account
*Flexion, in anatomy, a position made possible by the joint angle decreasing