PDF is most commonly used to refer to a type of Portable Document Format in computing.

Other uses include the following:

In education

• Postdoctoral fellow

In fiction

• Planetary Defence Force in the Warhammer 40,000 universe

In the military

• Panama Defense Forces
• P.D.F. (upper case) is an abbreviation of "Permanent Defence Forces" - the standing branches of the Irish Defence Forces
• Peoples Defence Force - the army of Grenada prior to the US led invasion in 1983

In science

• Atomic pair distribution function (Physics)
• Parkinson's Disease Foundation (Medicine)
• Parton Distribution Functions (Physics)
• Planar deformation features (Geology)
• Polypeptide Deformylase (Chemistry)
• Powder Diffraction File (Physics)
• pdf and p.d.f. (lower case) can refer to "probability density function" (Mathematics, statistics and probability)
• PDF and P.D.F. (upper case) can refer to "probability distribution function" (Mathematics, statistics and probability)

In software

• Package Definition File (Microsoft Systems Management Server)
• Portable Document Format

Additional uses

• KPDF-CA, a television station in Phoenix, Arizona
• PDF417, a 2D barcode - PDF means Portable Data File
• PDF Solutions, a listed company headquartered in San Jose, California
• Peace Development Fund, a non-profit public foundation based in Amherst, Massachusetts
• Peak draw force in a Compound bow in Archery
• Playa del Fuego, a Delaware art festival inspired by the annual Nevada Burning Man festival

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