XER

XER can stand for:


 * XER (Villa Acuña), a radio station in the early 1930s in Villa Acuña, Mexico
 * XER-AM (now XHR-FM), a radio station in Linares, Nuevo León, Mexico
 * XML Encoding Rules, a set of ASN.1 encoding rules for formatting data in XML
 * The ICAO Code for Xerox Corporation, United States