Christopher Busby (born 1 September 1945) is a British scientist primarily studying the health effects of internal ionising radiation.
Busby is a director of Green Audit Limited, a private company, and scientific advisor to the Low Level Radiation Campaign (LLRC) Following the 2011 Fukushima Daiichi nuclear disaster, Busby established a television and internet presence where he discussed the risks of ionizing radiation and the Japanese Government's handling of the disaster.
A Japanese language website marketed tests and a mineral supplement (dubbed an "anti-radiation" pill, and condemned by leading scientists as "useless") that Busby advised could mitigate the effects of ingested radioisotopes.