A cyborg (short for "cybernetic organism") is a theoretical or fictional being with both organic and biomechatronic parts. The term was coined in 1960 by Manfred Clynes and Nathan S. Kline. D. S. Halacy's Cyborg: Evolution of the Superman in 1965 featured an introduction which spoke of a "new frontier" that was "not merely space, but more profoundly the relationship between 'inner space' to 'outer space' – a bridge...between mind and matter."

The term cyborg is not the same thing as bionic and often applied to an organism that has restored function or enhanced abilities due to the integration of some artificial component or technology that relies on some sort of feedback. While cyborgs are commonly thought of as mammals, they might also conceivably be any kind of organism and the term "Cybernetic organism" has been applied to networks, such as road systems, corporations and governments, which have been classed as such. The term can also apply to micro-organisms which are modified to perform at higher levels than their unmodified counterparts. It is hypothesized that cyborg technology will form a part of the future human evolution.