PID

PID or Pid may refer to:

Medicine

 * Pelvic inflammatory disease or pelvic inflammatory disorder, an infection of the upper part of the female reproductive system
 * Primary immune deficiency, disorders in which part of the body's immune system is missing or does not function properly
 * Prolapsed intervertebral disc, commonly called a herniated disc

Science, technology and engineering

 * BBC Programme Identifier, a unique identifier for a BBC television or radio programme brand, a season or series, or an individual episode
 * OBD-II PIDs (on-board diagnostics parameter IDs), requests for data through an OBD connector in automotive repair
 * Packet Identifier, a field in a MPEG transport stream packet


 * Partial information decomposition, an extension of information theory
 * Passive infrared detector, a passive infrared sensor
 * Payload Interface Document (used on space engineering program for example)
 * Persistent identifier, a long-lasting reference to a document, file, web page, or other object
 * Phosphotyrosine-interacting domain, also known as phosphotyrosine-binding domain, a protein domain which bind to phosphotyrosine
 * Photoionization detector, measures volatile organic compounds and other gases
 * Physical Interface Device, a class of a USB device
 * PID controller (proportional-integral-derivative controller), a control concept used in automation
 * Piping and instrumentation diagram (P&ID), a diagram in the process industry which shows the piping of the process flow etc.
 * Principal ideal domain, an algebraic structure
 * Process identifier, a number used by many operating systems to identify a process

Organisations

 * Police Intelligence Department, a staff department of the Singapore Police Force
 * Political Intelligence Department (disambiguation), multiple organisations
 * Politieke Inlichtingen Dienst (Political Intelligence Department), was the main security agency for the Dutch East Indies
 * Prague Integrated Transport (Pražská integrovaná doprava – PID in Czech), an integrated public transport system in Prague

Other uses

 * Pathways into Darkness, a 1993 video game by Bungie
 * "Paul is dead", a 1960s urban legend that Paul McCartney was dead
 * Pid (video game), a 2012 video game by Might and Delight
 * Project Initiation Documentation, in project management
 * Party identification, the political party with which an individual identifies
 * Everett Pid Purdy (1904–1951), American athlete who played in both Major League Baseball and the National Football League