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