0X or 0-X ("zero/oh ex") may refer to:
Computing 0x, prefix for a hexadecimal numeric constant C++11, standard for the C++ programming language (previously C++0x)
In fiction Zero-X, a spacecraft from the Thunderbirds and Captain Scarlett puppet series , a living cellular automaton from the Of Man and Manta novels
Vehicle Zero X, an electric motorcycle model
See also Ox (disambiguation) X0 (disambiguation) Zerox (fictional planet), in DC Comics