| Xinyang | Xinyang |
| Xinzo de Limia | Xinzo de Limia |
| Xiongnu | Xiongnu |
| xipamide | Xipamid |
| Xipe Totec | Xipe Totec |
| Xiphias | Goldfisch |
| Xiphos | Xiphos |
| xipranolol | Xipranolol |
| Xishuangbanna Dai Autonomous Prefecture | Xishuangbanna |
| Xiuhcoatl | Xiuhcoatl |
| Xkcd | Xkcd |
| XL | XL |
| XL Airways | XL Airways UK |
| XL Airways France | XL Airways France |
| XL capsule | Retardkapsel |
| XL capsules | Retardkapseln |
| XL Recordings | XL Recordings |
| XLR audio connector | XLR-Steckverbinder |
| XLR connector | XLR |
| Xmas | Weihnachten |
| Xmas bonus | Weihnachtsgeld |
| Xmas book | Weihnachtsbuch |
| Xmas card | Weihnachtskarte |
| Xmas film | Weihnachtsfilm |
| Xmas illumination | Weihnachtsbeleuchtung |
| Xmas Massacre | Mädchen in den Krallen teuflischer Bestien |
| Xmas movie | Weihnachtsfilm |
| Xmas mystery | Weihnachtskrimi |
| Xmas novel | Weihnachtsroman |
| Xmas performance | Weihnachtsaufführung |
| Xmas postcard | Weihnachtspostkarte |
| Xmas spirit | Weihnachtsstimmung |
| Xmas story | Weihnachtsgeschichte |
| Xmas thriller | Weihnachtsthriller |
| Xmas tree | Weihnachtsbaum |
| Xmastree antenna | Fischgrätenantenne |
| XML | XML |
| XML database | XML-Datenbank |
| XML editor | XML-Editor |
| XML Metadata Interchange | XML Metadata Interchange |
| XML Namespace | Namensraum |
| XML Schema | XML-Schema |
| XML Schema Definition | XML Schema |
| XML Shareable Playlist Format | XML Shareable Playlist Format |
| XMLHttpRequest | XMLHttpRequest |
| XMM-Newton | XMM-Newton |
| XMMS | X MultiMedia System |
| XMODEM | XModem |
| XMPP | Jabber |
| xoanon | Xoanon |
| Xochimilco | Xochimilco |
| Xochipilli | Xochipilli |
| Xochiquetzal | Xochiquetzal |
| xonotlite | Xonotlit |
| Xonrupt-Longemer | Xonrupt-Longemer |
| XOOPS | Xoops |
| XOOPS Cube | Xoops |
| xor | Exklusiv oder |
| XOR circuit | EXKLUSIV-ODER-Glied |
| XOR element | EXKLUSIV-ODER-Glied |
| XOR function | EXKLUSIV-ODER-Verknüpfung |
| XOR gate | EXKLUSIV-ODER-Glied |
| XOR operation | EXKLUSIV-ODER-Verknüpfung |
| XOR swap algorithm | Swap |
| Xorazm Province | Choresmien |
| XP : eXPerience | Erfahrung |
| XP : Jesus Christ | Jesus Christus |
| XPCOM | Cross Platform Component Object Model |
| XPD | Kreuzpolarisationsentkopplung |
| XPDL | XML Process Definition Language |
| XPInstall | XPI |
| XQuery | XQuery |
| XR capsule | Retardkapsel |
| XR capsules | Retardkapseln |
| XScale | XScale |
