LDX or ldx may refer to:
- Levitated Dipole Experiment, nuclear fusion energy generation experiment
- Lisdexamfetamine, stimulant prodrug
- Saint-Laurent-du-Maroni Airport, Saint-Laurent-du-Maroni, French Guiana (IATA:
LDX
) - Long distance xerography, an early form of facsimile transmission invented by the Xerox corporation