QED

QED may refer to:

Mathematics, science, and technology

• Q.E.D. (quod erat demonstrandum), used at the end of a mathematical proof
• Quantum electrodynamics, a field in particle physics
• QED (text editor), a 1960s line-oriented editor
• QED manifesto and project, a database of mathematical knowledge
• QEMU Enhanced Disk, a deprecated disk image format for machine emulation and virtualization
• Quantum Effect Devices, a microprocessor design company

Television

• KQED (TV), public television station in San Francisco, California
• Q.E.D. (U.S. TV series)
• Q.E.D. (UK TV series)
• WQED (TV), public television station in Pittsburgh, Pennsylvania

Music

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

Other uses

• Granville Gee Bee R-6, named "Q.E.D.", a 1930s racing monoplane
• QED: The Strange Theory of Light and Matter, a 1985 physics book by Richard Feynman
• Quod Erat Demonstrandum, a 1903 novel by Gertrude Stein
• Q.E.D. (novel), a 1930 mystery novel by Lynn Brock
• Quod Erat Demonstrandum (film), a 2013 Romanian drama film
• QED (play), a 2001 play by Peter Parnell about Richard Feynman
• Q.E.D. (manga), a 1997 manga by Motohiro Katou
• QED International, a film company
• 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