| X Games | X Games |
| X Japan | X Japan |
| X Región de Los Lagos | Región de los Lagos |
| X Window System | X Window System |
| X-Chat | XChat |
| X-COM | X-COM |
| X-Men | X-Men |
| xabeque | Schebecke |
| Xabi Alonso | Xabi Alonso |
| Xabier Zandio | Xabier Zandio |
| Xainsomboun | Saysomboun |
| Xalapa | Jalapa Enríquez |
| XAML | XAML |
| Xanadú | Xanadu |
| Xanana Gusmão | Xanana Gusmão |
| Xandros | Xandros |
| Xantelasma | Xanthelasma |
| xanthelasma | Xanthelasma |
| Xanthippa | Xanthippe |
| Xanthophyta | Gelbgrüne Algen |
| Xanthosoma sagittifolium | Tannia |
| Xanti | Xanthi |
| xantina | Xanthin |
| Xantoma | Xanthom |
| xantófila | Xanthophyll |
| Xantófilas | Xanthophylle |
| Xavantes | Xavante |
| Xavi Hernández | Xavi |
| Xavier Bichat | Marie François Xavier Bichat |
| XD-Picture Card | XD-Picture Card |
| XDCC | XDCC |
| XDMCP | X Display Manager |
| XDR | External Data Representation |
| Xena | Xena |
| Xenarthra | Nebengelenktiere |
| Xenicus lyalli | Stephenschlüpfer |
| Xenobiótico | Xenobiotika |
| xenofobia | Fremdenfeindlichkeit |
| Xenofon Zolotas | Xenophon Zolotas |
| Xenoforme | Xenomorph |
| Xenolito | Xenolith |
| Xenophyophorea | Xenophyophoren |
| Xenopus | Krallenfrösche |
| Xenopus laevis | Krallenfrosch |
| Xenotarsosaurus | Xenotarsosaurus |
| xenotrasplante | Xenotransplantation |
| Xenoturbellida | Xenoturbella |
| Xenu | Xenu |
| Xenócrates | Xenokrates |
| Xenófanes | Xenophanes |
| xenófoba | Fremdenfeind |
| xenófobo | Fremdenfeind |
| xenón | Xenon |
| Xerces | Xerces |
| Xerez Club Deportivo | Deportivo Xerez |
| Xerodermia pigmentosa | Xeroderma pigmentosum |
| xeroftalmia | Xerophthalmie |
| xeroftalmía | Xerophthalmie |
| Xerophyllum tenax | Bärengras |
| Xerostomía | Mundtrockenheit |
| Xerox | Xerox |
| Xerox Alto | Xerox Alto |
| Xerox PARC | Xerox PARC |
| Xerxes | Xerxes |
| Xerófila | Xerophilie |
| xerófilo | xerophil |
| Xerófito | Xerophyt |
| Xestobium rufovillosum | Gescheckter Nagekäfer |
| XETRA | Xetra |
| Xfce | Xfce |
| XFL | XFL |
| XGA | Extended Graphics Array |
| Xgl | Xgl |
| xhosa | Xhosa |
| XHTML | Extensible Hypertext Markup Language |
| xi | Xi |
| Xi Jiang | Westfluss |
| XI Región de Aisén del General Carlos Ibáñez del Campo | Región de Aisén |
| Xi Scorpii | Grafias |
| Xi Shun | Bao Xishun |
| Xi Wangmu | Xiwangmu |
| Xiamen | Xiamen |
| Xianbei | Xianbei |
| Xiang Yu | Xiang Yu |
