**QED** might refer to:

## Mathematics, science, and technology

*Quod erat demonstrandum*(Q.E.D.), used at the end of a mathematical proof- Quantum electrodynamics, in particle physics
- QED (text editor), a 1960s line-oriented editor
- QED manifesto and project, a database of mathematical knowledge
- Quantum Effect Devices, a microprocessor design company

## Entertainment and media

*QED: The Strange Theory of Light and Matter*, a 1985 physics book by Richard Feynman*QED*(play), a 2001 play by Peter Parnell about Richard Feynman*Q.E.D.*(manga), a 1997 detective manga series by Motohiro Katou- QED International, a film finance, production, and sales company founded by Bill Block in 2002

### Television and film

*Q.E.D.*(U.S. TV series), a 1982 adventure series*Q.E.D.*(BBC TV series), a British science series*Quod Erat Demonstrandum*(film), a 2013 Romanian film- Quantum Entanglement Device, a prop used in the television show
*FlashForward*

### Music

- QED (band), a 1980s Australian New Wave band including Jenny Morris
*Q.E.D.*(album), a 1993 album by Terje Rypdal- QED Records, a temporary name of Emanem Records

## Other uses

- QED: Question. Explore. Discover, a two-day sceptical science festival in Manchester by the Merseyside Skeptics Society