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 See also Xe (disambiguation)