XNS
XNS or xns may refer to:

Computing
 Xerox Network Systems, an early computer networking protocol suite
 Extensible Name Service, an XML-based digital identity architecture

Other uses
 Kanashi language (ISO 639:xns), a Sino-Tibetan language
 Navtech System Support (IATA code: XNS), in the List of airline codes
 Christians (XNS), in the List of acronyms: X