Michael John Moorcock is an English writer, primarily known for his works in science fiction and fantasy. He has also published a number of literary novels, comic thrillers, graphic novels, and non-fiction. His most renowned works feature the character Elric of Melniboné, which significantly influenced fantasy literature in the 1960s and 1970s.

As the editor of the controversial British science fiction magazine New Worlds, from May 1964 until March 1971 and again from 1976 to 1996, Moorcock was instrumental in fostering the development of the science fiction "New Wave" in the UK and indirectly in the United States. This movement was a precursor to cyberpunk. His decision to serially publish Bug Jack Barron (1969) by Norman Spinrad was particularly notable, drawing criticism from some British MPs due to the magazine's public funding.

In addition to writing, Moorcock is an accomplished musician, having worked with bands such as Hawkwind, Blue Öyster Cult, Robert Calvert, and Spirits Burning, as well as his own project, Michael Moorcock & The Deep Fix.

In 2008, The Times recognized Moorcock as one of "The 50 greatest British writers since 1945".