PPD may refer to:
- Computing
- Points Per Day is a mechanism for measuring work done in the Folding@home distributed computing project
- PostScript Printer Description files are created by vendors to describe the entire set of features and capabilities available for their PostScript printers
- Political parties
- Popular Democratic Party of Puerto Rico (Partido Popular Democrático), a political party in Puerto Rico
- Partido Popular Democrático/Partido Social Democrata, a political party in Portugal
- Partito Popolare Democratico Svizzero, a political party in Switzerland
- Party for Democracy (Partido por la Democracia), a political party in Chile
- Science and Medicine
- p-Phenylenediamine, an aromatic amine
- Paranoid personality disorder, a psychiatric diagnosis
- Persistent Pigment Darkening, a measure of UVA protection by sunscreens
- Pharmaceutical Product Development, a global contract research organization (CRO)
- Postharvest physiological deterioration, a process that renders root tubers of cassava black and inedible
- Postpartum depression, an after childbirth condition, is a mental health disorder striking women within the first year after giving birth
- Pour Point Depressant, a chemical added to crude oil to depress (lower) the Pour point
- ppd, Protopanaxadiol, an active molecule
- Purified Protein Derivative, also known as the Mantoux screening test, Tuberculin Sensitivity Test, Pirquet test, or PPD test, used for tuberculosis testing
- Miscellaneous
- Pani Poni Dash!, an anime series
- Partners in Population and Development, an intergovernmental organization
- Philadelphia Police Department, a police agency in Pennsylvania, U.S.
- Phoenix Police Department, a police agency in Arizona, U.S.
- Pontypridd railway station, Wales, National Rail station code
- PPD-40, a Russian submachine gun
- Pre-Paid Legal Services, Inc. New York Stock Exchange ticker symbol
- Published Price to Dealer, a music industry term designating unit price
- Postponed, most commonly a sporting event, especially baseball, usually due to rain, see also Rainout (sports)
- Game
- Punch Pear Day is a day that is on December 1 of every year that celebrates Punch Pear or PP with a 1 hour and thirty minute Christmas special.
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