QED

QED may refer to:

Mathematics and science

 * Q.E.D. (quod erat demonstrandum), used at the end of a mathematical proof
 * Quantum electrodynamics, a field in particle physics
 * QED manifesto and project, a database of mathematical knowledge
 * QED: The Strange Theory of Light and Matter, a 1985 physics book by Richard Feynman

Computing and electronics

 * QEMU Enhanced Disk, a deprecated disk image format for machine emulation and virtualization
 * QED (text editor), a 1960s line-oriented editor
 * Quantum Effect Devices, a microprocessor design company

Literature

 * Quod Erat Demonstrandum, a 1903 novel by Gertrude Stein
 * Q.E.D. (novel), a 1930 mystery novel by Lynn Brock
 * Q.E.D. (manga), a 1997 manga by Motohiro Katou

Albums

 * QED (band), a 1980s Australian band
 * Q.E.D. (Terje Rypdal album), 1993
 * Q.E.D. (Jim Allchin album)
 * QED Records or Emanem Records

Stage and screen

 * Quod Erat Demonstrandum (film), a 2013 Romanian drama film
 * QED (play), a 2001 play by Peter Parnell about Richard Feynman
 * QED International, a film company

Television

 * KQED (TV), public television station in San Francisco, California, USA; also known as "QED"
 * Q.E.D. (U.S. TV series)
 * Q.E.D. (UK TV series)
 * WQED (TV), public television station in Pittsburgh, Pennsylvania, USA; also known as "QED"

Radio

 * KQED-FM (88.5), an NPR radio station in San Francisco, California, USA; also known as "QED"
 * WQED-FM (89.3), an NPR radio station in Pittsburgh, Pennsylvania, USA; also known as "QED"

Other uses

 * Granville Gee Bee R-6, named "Q.E.D.", a 1930s racing monoplane
 * QED: Question, Explore, Discover, annual skeptical conference held in Manchester, UK
 * Quami Ekta Dal, a regional political party in India
 * Quiet Electric Drive, a US Navy program to develop technologies for silent maritime propulsion