PA3

PA3 may refer to:
 * ALCO PA-3, a diesel locomotive
 * Paranormal Activity 3, a 2011 American horror film
 * Pennsylvania Route 3
 * Pennsylvania's 3rd congressional district
 * Pitcairn PA-3 Orowing, a biplane
 * The PA3, a type of rolling stock used on the PATH train in New York and New Jersey
 * PA3 key, on the IBM 3270 keyboard