| xilose | xylose |
| Ximango | Chimango Caracara |
| Xindi | Xindi |
| xingamento | curse |
| xingar | abuse |
| Xinjiang | Xinjiang |
| Xintoísmo | Shinto |
| Xinzo de Limia | Xinzo de Limia |
| Xipe Totec | Xipe Totec |
| Xiphophorus hellerii | Green swordtail |
| Xiraz | Shiraz |
| Xirivella | Xirivella |
| xis | burger |
| xisto | schist |
| Xisto betuminoso | Bituminous shale |
| Xiuhcoatl | Xiuhcoatl |
| Xiuhtecuhtli | Xiuhtecuhtli |
| XIV dinastia egípcia | Fourteenth dynasty of Egypt |
| Xiva | Shiva |
| XiVenda | Venda language |
| XIX dinastia egípcia | Nineteenth dynasty of Egypt |
| XL | XL |
| XL Recordings | XL Recordings |
| XMI | XML Metadata Interchange |
| XML | XML |
| XML Schema | XML Schema |
| XMLHttpRequest | XMLHttpRequest |
| XMMS | XMMS |
| XO | One Laptop per Child |
| Xochipilli | Xochipilli |
| Xochiquetzal | Xochiquetzal |
| Xocotl | Xocotl |
| Xofrango | Osprey |
| Xogum | Shogun |
| xogunato | shogunate |
| Xogunato Tokugawa | Tokugawa shogunate |
| Xolotl | Xolotl |
| XOOPS | XOOPS |
| xor | xor |
| xoxota | cunt |
| XQuery | XQuery |
| XRI | Extensible Resource Identifier |
| XSLT | XSL Transformations |
| XSP | XSP |
| Xu Zhu | Xu Chu |
| xucro | untamed |
| Xucurus-cariris | Xucuru |
| XUL | XUL |
| Xunqueira de Ambía | Xunqueira de Ambía |
| Xunqueira de Espadanedo | Xunqueira de Espadanedo |
| Xuzhou | Xuzhou |
| XviD | Xvid |
| XVIII dinastia egípcia | Eighteenth dynasty of Egypt |
| XX dinastia egípcia | Twentieth dynasty of Egypt |
| XXII dinastia egípcia | Twenty-second dynasty of Egypt |
| Xàtiva | Xàtiva |
| xá | shah |
| xáquima | hackamore |
| Xátria | Kshatriya |
| Xântipe | Xanthippe |
| Xénio | Xenon |
| xícara | cup |
| xícara de chá | cup of tea |
