ALD
- ALD Automotive
- ALD-52
- ALDE (disambiguation)
- Adrenoleukodystrophy
- Aimé Leon Dore
- Alcoholic liver disease
- Ald (unit)
- Alde (disambiguation)
- Aldehyde
- Aldehyde dehydrogenase
- Alderley Edge railway station
- Alderman
- Alderney
- Alderson station
- Aldolase
- Alerta Airport
- Allahabad Junction railway station
- Arakan League for Democracy
- Assistive listening device
- Asymmetric Laplace distribution
- Atomic layer deposition
- Autonomy Liberty Democracy
- Fructose-bisphosphate aldolase
- Liberty dollar (private currency)
- Oxford Advanced Learner's Dictionary