QED (novel), by Gertrude Stein

Quantum electrodynamics, a field of physics

Q.E.D. (manga), a Japanese detective comic

Quantum Effect Devices, a maker of microprocessors

Quantum Explosion Dynamo, an object in the computer game Commander Keen

Q.E.D. Quod erat demonstrandum, a Latin phrase used at the end of a definitive proof

QED (book), Richard Feynman's book about quantum electrodynamics

QED project, a database of mathematical knowledge

Q.E.D. (US TV series)

QED (text editor)

QED Books and software, a maths-specialist company, now merged with Tarquin

QED (play), by Peter Parnell

KQED, a public broadcasting company based in San Francisco, California

WQED, a public broadcasting radio and television station in Pittsburgh, Pennsylvania