PA4 may refer to:
- ALCO PA-4, a diesel locomotive
- Paranormal Activity 4
- Pennsylvania Route 4
- Pennsylvania's 4th congressional district
- Pitcairn PA-4 Fleetwing II, a biplane
- PA4 paper; see Paper size
- The PA4, a type of rolling stock used on the PATH train in New York and New Jersey
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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