PD
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PD may refer to:
- Phase-change Dual, an optical media format
- Police department
- Production Diary
- Public domain
- Peu difficile, a French climbing/mountaineering grade
- Partidul Democrat (Democratic Party) of Romania
- Partai Demokrat (Democratic Party) of Indonesia
- Program director
- Photodiode
- A prefix for weapons demarking them as point defense weapons