| WMAN | Wireless Metropolitan Area Network | In English | → Telecommunications |
| WMS | Web Management System | In English | → Software → Internet |
| WPAN | Wireless Personal Area Network | In English | |
| WPAN | Wireless Personal-Area Network | In English | → Telecommunications |
| WPS | Web Positioning System | In French | |
| WS-I | Web Services Interoperability | In English | → Telecommunications |
| WSCI | Web Services Choreography Interface | In English | |
| WSCL | Web Services Conversation Language | In English | → Programming languages |
| WSDL | Web Service Description Language | In English | → Software |
| WSDL | Web Services Description Language | In English | → Telecommunications |
| WSFL | Web Services Flow Language | In English | → Programming languages |
| WSOA | Web Services Oriented Architecture | In English | → Software |
| WTLS | Wireless Transport Layer Security | In English | → Telecommunications |
| WWW | World Wide Web = TTT | Tut-Tera Teksaĵo | In Esperanto |
In English | → Internet |
| XBEL | XML Bookmark Exchange Language | In English | → Programming languages → Libraries |
| XDM | XPath Data Model | In English | → Data |
| XEP | XMPP Extension Proposal | In English | → Telecommunications |
| XFN | XHTML (EXtensible HyperText Markup Language) Friends Network | In English | → Programming languages → Data" |
| XHTML-MP | Extensible Hypertext Markup Language - Mobile Profile | In English | → Telecommunications |
| XINS | XML Interface for Network Services | In English | |
| XMPP | EXtensible Messaging and Presence Protocol | In English | |
| XSS | Cross-Site Scripting Attack | In English |
|