Pir

Pir may refer to:

*Pir (Sufism), a Sufi teacher, spiritual leader
*Pir (Zoroastrianism), a site in Persia, frequently one of the Zoroastrian faith
*Pir of the Britons, legendary king of the Britons
*Pir, Satu Mare, commune in Satu Mare County, Romania

PIR may refer to:
In science:
*Protein Information Resource, a major protein information database and bioinformatics resource
*Partners in Research, a Canadian charity dedicated to bio-medical research
*Parrot Intermediate Representation, part of Parrot virtual machine
*Passive infrared sensor, an often used part of a security system
*Polyisocyanurate, a plastic typically produced as a foam for thermal insulation
*Prosopographia Imperii Romani, an index of all persons mentioned in ancient literature from the Roman Republic to the Roman Empire

In information technology:
*Peak Information Rate
*Public Interest Registry, a not-for-profit corporation responsible for managing the .org top-level domain.
*Public Information Research, a non-profit corporation that maintains Namebase, an online database of citations to influential people
*Private information retrieval, a protocol that allows a user to retrieve an item from a server in possession of a database without revealing which item she is retrieving
*Process Incident Report

In transportation:
*Pierre Regional Airport
*Phoenix International Raceway
*Portland International Raceway

Other:
*Parachute Infantry Regiment
*Post-Implementation Review
*Public Infrastructure Renewal, a ministry of the Government of Ontario
*The Price Is Right (US game show)
*Property Irregularity Report, what is filled out at the baggage claim when a baggage is lost.