| x-benen | X-Beine |
| X-chromosoom | X-Chromosom |
| X-Men | X-Men |
| X-stralen | Röntgenstrahlung |
| x-vormige kruising | Chiasma |
| Xabi Alonso | Xabi Alonso |
| Xabier Zandio | Xabier Zandio |
| Xagħra | Xagħra |
| Xalapa | Jalapa Enríquez |
| Xalapa de Enríquez | Jalapa Enríquez |
| XAML | XAML |
| Xanadu | Xanadu |
| Xanana Gusmão | Xanana Gusmão |
| Xandros Desktop OS | Xandros |
| Xanten | Xanten |
| Xanthaangom | Xanthan |
| Xanthelasma | Xanthelasma |
| Xanthi | Xanthi |
| xanthine | Xanthin |
| Xanthippe | Xanthippe |
| Xanthippus | Xanthippos |
| Xanthofyl | Xanthophylle |
| Xanthorrhoea | Grasbäume |
| Xanthus en Balius | Xanthos und Balios |
| xantofyl | Xanthophyll |
| Xantusiidae | Nachtechsen |
| Xavante | Xavante |
| Xaver Scharwenka | Xaver Scharwenka |
| Xaverius | Xaver |
| Xavi Hernández | Xavi |
| Xavier Bichat | Marie François Xavier Bichat |
| Xavier van Bourbon-Parma | Franz Xavier von Bourbon-Parma |
| XChat | XChat |
| XD-Picture Card | XD-Picture Card |
| Xebec | Schebecke |
| Xenarthra | Nebengelenktiere |
| Xenia Aleksandrovna van Rusland | Xenia Alexandrowna Romanowa |
| Xenix | Xenix |
| Xenobioticum | Xenobiotika |
| Xenofilie | Xenophilie |
| xenofobie | Fremdenfeindlichkeit |
| xenofobisch | xenophobisch |
| xenofoob | Fremdenfeind |
| Xenoliet | Xenolith |
| xenon | Xenon |
| Xenonlamp | Xenonlicht |
| Xenophanes | Xenophanes |
| Xenophon | Xenophon |
| Xenophon van Efese | Xenophon von Ephesos |
| Xenotarsosaurus | Xenotarsosaurus |
| Xenotiem | Xenotim |
| xenotransplantatie | Xenotransplantation |
| Xenoturbellida | Xenoturbella |
| Xenu | Xenu |
| Xeon | Intel Xeon |
| Xerces | Xerces |
| Xeres | Sherry |
| Xerez CD | Deportivo Xerez |
| Xeroderma pigmentosum | Xeroderma pigmentosum |
| Xerofiel | Xerophilie |
| Xerofyt | Xerophyt |
| Xerografie | Elektrofotografie |
| Xerografisch | Xerographie |
| Xerostomie | Mundtrockenheit |
| Xerxes | Xerxes |
| Xewkija | Xewkija |
| Xfce | Xfce |
| Xhosa- | Xhosa |
| XHTML Mobile Profile | XHTML Mobile Profile |
| xi | Xi |
| Xi en He | Hsi-Ho |
| Xi Jiang | Westfluss |
| Xi Shun | Xi Shun |
| Xia Huai | Xia-Dynastie |
| Xia Jie | Xia Jie |
| Xia Qi | Xia Qi |
| Xia Yu | Yu der Große |
| Xia-dynastie | Xia-Dynastie |
| Xiamen | Xiamen |
| Xianbei | Xianbei |
| Xianfeng | Xianfeng |
| Xiangfan | Xiangfan |
| Xianyang | Xianyang |
| Xie Jun | Xie Jun |
| Xie Xingfang | Xie Xingfang |
| Xigazê | Xigazê |
| Xing Huina | Xing Huina |
| Xing Yi Quan | Xingyiquan |
| Xingu | Rio Xingu |
| Xining | Xining |
| Xinzo de Limia | Xinzo de Limia |
| Xiong Nu | Xiongnu |
| Xipe Totec | Xipe Totec |
| Xishuangbanna | Xishuangbanna |
| XL | XL |
| XLR | XLR |
| XML Query Language | XQuery |
| XML Schema Definitietaal | XML-Schema |
| XMLHTTP | XMLHttpRequest |
| XMMS | X MultiMedia System |
| XMP | Extensible Metadata Platform |
| XNA | XNA |
| XNOR-poort | XNOR-Gatter |
| Xochimilco | Xochimilco |
| Xochipilli | Xochipilli |
| Xochiquetzal | Xochiquetzal |
| XOOPS | Xoops |
| XOR-poort | XOR-Gatter |
| XQuery | XQuery |
| Xu Yuhua | Xu Yuhua |
| Xuande | Xuande |
| Xuanwu-district | Xuanwu Bezirk |
| Xuanzang | Xuanzang |
| Xujiahui | Xujiahui-Kathedrale |
| XUL | XML User Interface Language |
| Xuzhou | Xuzhou |
| XviD | Xvid |
| xyleem | Xylem |
| Xyleen | Xylol |
| Xylenol | Xylenole |
| xylitol | Xylitol |
| xylofoon | Xylofon |
