PDD (disambiguation)
- Camurati–Engelmann disease
- Clean Development Mechanism
- Developmental disability
- New Zealand Fungarium
- P. Diddy
- Parkinson's disease dementia
- Party for Democratic Action
- Pas de deux
- Penile dysmorphic disorder
- Percentage depth dose curve
- Pervasive developmental disorder
- Pinduoduo
- Pinky Dinky Doo
- Please Don't Destroy
- Portable Document Format
- Prescribed daily dose
- Process Driven Development
- Professional Disc for DATA
- Proventricular dilatation disease
- Public Domain Day
- Pulsed discharge ionization detector