John Birmingham (born 7 August 1964) is a British-born Australian author.
In 2004 he published the alternate history Weapons of Choice, the first in the Axis of Time trilogy, a series of Tom Clancy-like techno-thrillers. Many writers from those genres appear as minor characters. It was published by Del Rey Books in the United States, and by Pan Macmillan in Australia.

The series tells of a multinational peacekeeping force from the early 21st century being taken back in time to 1942, where its presence completely changes the course of the Second World War. In August 2005, the second book, Designated Targets was published in Australia. Publication in the United States followed in October 2005.

The third and final book in the trilogy, Final Impact, was released in Australia in early August 2006, and was released in the United States in January 2007. The ABC reported in 2006 that there were two new Birmoverse books in the works, one set shortly after the end of the war, and another in the alternate 1980s, said to feature a dashing young RAF pilot: Richard Branson