Other
- Pathways Into Darkness, a 1993 video game by Bungie Studios
- Parameter ID, in automotive repair, PIDs are requests for data through an OBD connector
- Paul Is Dead, a 1960s urban legend that Paul McCartney was dead
- Pid (video game), a 2012 video game by Might and Delight
- Principal ideal domain, in abstract algebra, an integral domain in which every ideal is principal
Read more about this topic: PID