PID

PID may refer to:

Medicine

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

Technology and engineering

• BBC Programme Identifier, a unique identifier
• Photoionization detector, measures volatile organic compounds and other gases
• Process identifier, a number used by many operating systems to identify a process
• 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.
• Passive infrared detector, a passive infrared sensor
• 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
• Physical Interface Device, a class of a USB device

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

Other uses

• Principal ideal domain, in abstract algebra
• Project Initiation Documentation, in project management
• Pathways into Darkness, a 1993 video game by Bungie Studios
• "Paul is dead", a 1960s urban legend that Paul McCartney was dead
• Pid (video game), a 2012 video game by Might and Delight