| X-Wing | X-wing |
| Xabi Alonso | Xabi Alonso |
| Xai-Xai | Xai-Xai |
| XAML | XAML |
| Xanadu | Xanadu |
| Xanana Gusmão | Xanana Gusmão |
| Xanatos | Xanatos |
| Xanten | Xanten |
| Xanthi | Xanthi |
| Xanthippos | Santippo |
| xantippa | Santippe |
| Xantofyll | Xantofille |
| Xantomatos | Xantoma |
| Xavi | Xavi |
| Xavier | Saverio |
| XBoard | WinBoard |
| XChat | XChat |
| XD-Picture Card | XD-Picture Card |
| Xedos | Xedos |
| Xena - Krigarprinsessan | Xena |
| Xenia av Sankt Petersburg | Xenia di San Pietroburgo |
| Xenix | Microsoft XENIX |
| Xenofon | Senofonte |
| xenon | xeno |
| Xenophanes | Senofane |
| xenotransplantation | xenotrapianto |
| Xenu | Xenu |
| Xeon | Xeon |
| Xerez CD | Xerez Club Deportivo |
| Xerox | Xerox Corporation |
| Xerxes I | Serse I di Persia |
| Xerxes II | Serse II di Persia |
| Xfce | Xfce |
| Xfera | Yoigo |
| XGL | Xgl |
| xhosa | xhosa |
| XHTML | XHTML |
| Xi | Xi |
| Xiadynastin | Dinastia Xia |
| Xiamen | Xiamen |
| Xiang | Lingua xiang |
| Xiangqi | Xiangqi |
| Xidi | Xidi |
| Xindi | Xindi |
| Xingyi | Xingyiquan |
| Xining | Xining |
| Xinjiang | Xinjiang |
| Xiongnu | Xiongnu |
| Xiuhtlecutli | Xiuhtecuhtli |
| XLR-kontakt | Connettore XLR |
| XMI | XML Metadata Interchange |
| XML | XML |
| XMMS | XMMS |
| Xochimilco | Xochimilco |
| XOOPS | XOOPS |
| XOR | Disgiunzione esclusiva |
| XQuery | XQuery |
| XScale | XScale |
| Xserve | Famiglia Xserve |
| XSL | Extensible Stylesheet Language |
| XSLFO | XSL-FO |
| XSLT | XSL Transformations |
| Xuanzang | Xuanzang |
| XUL | XUL |
| XXx | XXX |
| xylen | xilene |
| xylofon | xilofono |
