| X-kromosom | X-Chromosom |
| X-Men | X-Men |
| X-strålar | Röntgenstrahlen |
| Xabi Alonso | Xabi Alonso |
| Xalapa | Jalapa Enríquez |
| XAML | XAML |
| Xanadu | Xanadu |
| Xanana Gusmão | Xanana Gusmão |
| Xandros | Xandros |
| Xantelasma | Xanthelasma |
| Xanten | Xanten |
| Xanthi | Xanthi |
| Xanthippos | Xanthippos |
| xantin | Xanthin |
| Xantofyll | Xanthophylle |
| Xantomatos | Xanthom |
| Xavi | Xavi |
| Xavier | Xaver |
| XBoard | XBoard |
| Xbox Live Marketplace | Xbox Live Marktplatz |
| XChat | XChat |
| XD-Picture Card | XD-Picture Card |
| XDM | X Display Manager |
| Xena - Krigarprinsessan | Xena |
| Xenix | Xenix |
| Xenobiotika | Xenobiotika |
| xenofobi | Fremdenfeindlichkeit |
| Xenofon | Xenophon |
| Xenoglaux loweryi | Peruanerkauz |
| Xenolit | Xenolith |
| xenon | Xenon |
| Xenontrioxid | Xenon-oxid |
| Xenophanes | Xenophanes |
| xenotransplantation | Xenotransplantation |
| Xenu | Xenu |
| Xeon | Intel Xeon |
| Xerez CD | Deportivo Xerez |
| Xerox | Xerox |
| Xerxes | Xerxes |
| Xfce | Xfce |
| XGA | Extended Graphics Array |
| XGL | Xgl |
| xhosa | Xhosa |
| XHTML | Extensible Hypertext Markup Language |
| Xi | Xi |
| Xi Wangmu | Xiwangmu |
| Xiadynastin | Xia-Dynastie |
| Xiamen | Xiamen |
| Xiang | Xiang |
| Xiangqi | Xiangqi |
| Xibalba | Xibalbá |
| Xichang Satellite Launch Center | Kosmodrom Xichang |
| Xie Xingfan | Xie Xingfang |
| xilos | Xylose |
| Xingyi | Xingyiquan |
| Xinhairevolutionen | Xinhai-Revolution |
| Xining | Xining |
| Xinjiang | Xinjiang |
| Xiongnu | Xiongnu |
| Xishuangbanna | Xishuangbanna |
| Xixia | Tanguten |
| Xkcd | Xkcd |
| XL Recordings | XL Recordings |
| XLR-kontakt | XLR |
| XMI | XML Metadata Interchange |
| XML | XML |
| XMMS | X MultiMedia System |
| XNOR | XNOR-Gatter |
| Xochimilco | Xochimilco |
| XOOPS | Xoops |
| XOR | XOR-Gatter |
| XQuery | XQuery |
| XScale | XScale |
| Xserve | Apple Xserve |
| XSL | Extensible Stylesheet Language |
| XSLT | XSL Transformation |
| Xu | Xu |
| Xuanzang | Xuanzang |
| XUL | XML User Interface Language |
| Xuxa | Xuxa |
| XXX syndrom | Triplo-X-Syndrom |
| Xylan | Xylane |
| xylem | Xylem |
| xylen | Xylol |
| xylitol | Xylitol |
| xylofon | Xylofon |
