| X-Men | Les X-Men |
| X-Moto | Xmoto |
| X-Wing | X-wing |
| Xabi Alonso | Xabi Alonso |
| Xai-Xai | Xai-Xai |
| Xalapa | Jalapa |
| XAML | XAML |
| Xanadu | Xanadu |
| Xanana Gusmão | Xanana Gusmão |
| Xanatos | Xanatos |
| Xandros | Xandros |
| Xantelasma | Xanthelasma |
| Xanten | Xanten |
| Xanthippos | Xanthippe |
| Xantofyll | Xanthophylle |
| Xantomatos | Xanthome |
| Xavi | Xavi Hernández |
| Xavier | Xavier |
| XBoard | XBoard |
| XChat | XChat |
| XD-Picture Card | Carte XD |
| XDM | X display manager |
| Xen | Xen |
| Xenix | XENIX |
| Xenofon | Xénophon |
| xenon | xénon |
| Xenophanes | Xénophane de Colophon |
| xenotransplantation | xénogreffe |
| Xenu | Xenu |
| Xeon | Intel Xeon |
| Xerez CD | Xerez Club Deportivo |
| Xerox | Xerox |
| Xerxes | Xerxès |
| Xerxes I | Xerxès Ier |
| Xerxes II | Xerxès II |
| Xfce | Xfce |
| Xfera | Yoigo |
| XGA | Extended Graphics Array |
| XGL | Xgl |
| xhosa | xhosa |
| XHTML | XHTML |
| Xi | Xi |
| Xi Wangmu | Xiwangmu |
| Xiadynastin | Dynastie Xia |
| Xiamen | Xiamen |
| Xibalba | Xibalba |
| Xidi | Xidi |
| Xie Xingfan | Xie Xingfang |
| Xingyi | Xingyi quan |
| Xining | Xining |
| Xinjiang | Xinjiang |
| Xiongnu | Xiongnu |
| Xishuangbanna | Préfecture autonome dai de Xishuangbanna |
| Xiuhtlecutli | Xiuhtecuhtli |
| Xixia | Dynastie des Xia occidentaux |
| XLR-kontakt | XLR |
| XMI | XML Metadata Interchange |
| XML | Extensible Markup Language |
| XMMS | XMMS |
| Xochimilco | Xochimilco |
| XOOPS | Xoops |
| XQuery | XML Query |
| XScale | XScale |
| Xserve | Xserve |
| XSL | Extensible stylesheet language |
| XSLFO | XSL-FO |
| XSLT | Extensible Stylesheet Language Transformations |
| Xu | XU |
| Xuanzang | Xuanzang |
| XUL | XML-based User interface Language |
| Xuxa | Xuxa Meneghel |
| XXx | XXX |
| XXX syndrom | Syndrome triple X |
| xylen | xylène |
| xylofon | xylophone |
