PBX may refer to: Pakubuwono X, the tenth Susuhunan of Surakarta in Java, Indonesia. Polymer-bonded explosive. Pre-B-cell leukemia homeobox. Private branch exchange, a telephone exchange that serves a particular business or office. PBX Funicular Intaglio Zone, a 2012 album by John Frusciante. PBX, a rewrite of the Project Builder IDE for Mac OS X systems, now known as Xcode. PhotoBox, a digital photo printing service https://en.wikipedia.org/wiki/PBX