CJD can mean:
- Creutzfeldt-Jakob disease, a rare disease of the brain caused by prions, related to bovine spongiform encephalopathy
- Chronological Julian Day, an alternate way of expressing the Julian Date
- Christliches Jugenddorfwerk Deutschlands, a German Christian educational institution
- Abbreviation for Chojoongdong, the three major newspapers in South Korea.
- Dealerships that sell Chrysler, Jeep, and Dodge vehicles
- A defunct punk band from Brighton, England