PA4 may refer to:
*
ALCO PA-4
The ALCO PA was a family of A1A-A1A diesel locomotives built to haul passenger trains. The locomotives were built in Schenectady, New York, in the United States, by a partnership of the American Locomotive Company (ALCO) and General Electric (GE ...
, a diesel locomotive
* ''
Paranormal Activity 4
''Paranormal Activity 4'' is a 2012 American Found footage (film technique), found footage supernatural horror film, directed by Ariel Schulman and Henry Joost and written by Christopher Landon (filmmaker), Christopher Landon from a story by Cha ...
''
*
Pennsylvania Route 4
The following is a list of former state routes in Pennsylvania. These roads are now either parts of other routes or no longer carry a traffic route number. This list also includes original routes of numbers that were decommissioned and later rea ...
*
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
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