- A/D stands for Abandonment or Destruction
- AD stands for Aberforth Dumbledore (Harry Potter character)
- AD stands for Absolute Deviation
- AD stands for Academic Decathlon
- AD stands for Academic Don
- AD stands for Accastillage Diffusion (French: Distribution Fitting)
- AD stands for Access Denied
- AD stands for Accession Document
- AD stands for Accidental Damage
- AD stands for Accidental Death (life insurance)
- AD stands for Accidental Discharge
- AD stands for Acción Democrática (Democratic Action Party)
- AD stands for Accrued Depreciation (finance)
- AD stands for Accumulated Depreciation (accounting)
- AD stands for Accumulator Dehydrator (automotive A/C component)
- AD stands for Ace Deuce (band)
- AD stands for Acknowledgement Due (postal)
- AD stands for Acoustic Densitometry (ultrasound)
- AD stands for Acquisition and Divestiture
- AD stands for Acquisition Directorate