QED may refer to: Mathematics, science, and technology Q.E.D. (), 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