PPD

PPD may refer to:

Computing

 * Prearranged Payment and Deposit; a payment format used in US inter-bank debit and credit transactions, part of the ACH Network specifications.
 * Pixels per degree, a measure of the resolution of a display screen as seen from an angle
 * Points per day, a mechanism for measuring work done in the Folding@home distributed computing project
 * PostScript Printer Description, a file created by a printer vendor that describes the entire set of capabilities of a particular PostScript printer model

Police and security

 * Personal protection detail, a security detail tasked with protecting one or more persons
 * Philadelphia Police Department, a police agency in Pennsylvania, United States
 * Phoenix Police Department, a police agency in Arizona, United States
 * Presidential Protective Division, part of the United States Secret Service tasked with protecting the President and others
 * Probation and Parole Division in New Mexico, United States

Political parties

 * Social Democratic Party (Portugal) (Partido Social Democrata), originally named Popular Democratic Party or Democratic People's Party (Partido Popular Democrático), a political party in Portugal
 * Partito Popolare Democratico Svizzero, a political party in Switzerland
 * Party for Democracy (Chile) (Partido por la Democracia), a political party in Chile
 * Popular Democratic Party (Puerto Rico) (Partido Popular Democrático), a political party in Puerto Rico

Science and medicine

 * Paranoid personality disorder, a mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others.
 * p-Phenylenediamine, an aromatic amine
 * Persistent Pigment Darkening, a measure of UVA protection of sunscreens
 * Pharmaceutical Product Development, a global contract research organization (CRO)
 * Pheophorbidase, an enzyme
 * PPD test, Purified Protein Derivative test or Mantoux test, a screening test for tuberculosis
 * Postpartum depression, a mental disorder affecting parents within the first year of their child's birth
 * Pour point depressant, a chemical added to crude oil to lower its "pour point"
 * ppd, Protopanaxadiol, a molecule
 * Psychogenic polydipsia, excessive water intake with a psychiatric or pharmaceutical cause
 * Postharvest physiological deterioration, natural change of crop tissues which is undesirable for human or livestock use

Other

 * PPD, Inc., an American contract clinical trial company.
 * Pani Poni Dash!, a Japanese manga series
 * Partners in Population and Development, an international intergovernmental organization for "southern" countries worldwide
 * Pengangkutan Penumpang Djakarta, a bus operator in Jakarta, Indonesia
 * Pontypridd railway station, Wales, its National Rail station code
 * ppd, an American professional video game player
 * PPD-40, a Russian submachine gun
 * Prevention Project Dunkelfeld, an effort to help self-identifying pedophiles to stay offence free
 * Published Price to Dealer, a music industry term designating unit price
 * Presidential Policy Directive, a kind of national security directive from the Obama presidency