PDI

PDI may refer to:

Organisations

 * Investigations Police of Chile (Policia de Investigaciones de Chile)
 * Party for Justice and Integration (Partia për Drejtësi dhe Integrim), an Albanian political party
 * Pacific Data Images, former US computer animation company
 * Paul Drude Institute for solid state electronics, German research institute
 * Philippine Daily Inquirer, a newspaper
 * Plumbing & Drainage Institute, US
 * Ideal Democratic Party, political party in Rwanda
 * Partai Demokrasi Indonesia (Indonesian Democratic Party) (1973–2004), a defunct political party
 * Polo Democrático Independiente (Independent Democratic Pole), a Colombian democratic political party

Chemistry and biochemistry

 * Pyridinediimine, organic compounds used as ligands
 * Perylenediimide, a rylene dye
 * Photodynamic inactivation, or antimicrobial photodynamic therapy
 * Protein dispersibility index, in water
 * Protein disulfide isomerase, an enzyme
 * Polydispersity index, molecular weight distribution of polymers
 * Pentamethylene diisocyanate, a bio-based diisocyanate prepared from pentamethylene diamine

Computing

 * Pentaho Data Integration, design data flow software
 * Versit Consortium's Personal Data Interchange
 * Pop Directional Isolate, Unicode bidirectional text character
 * Portable Database Image format (.pdi)
 * Atmel Program and Debug Interface

Other

 * Postal Development Indicator, a UPU ranking
 * Peripheral drift illusion, a motion illusion
 * Pilot direction indicator, for aircraft bombing
 * Power Distance Index, a measure of social power acceptance
 * Powered Descent Initiation, of Apollo moon landing