| Xenoglossy | Glossolalie |
| Xenomorph | Alien |
| xenon | xenon |
| Xenopeltidae | Aardslangen |
| Xenopeltis unicolor | Regenboogslang |
| Xenophanes | Xenophanes |
| Xenophily | Xenofilie |
| xenophobe | xenofoob |
| xenophobia | xenofobie |
| xenophobic | xenofoob |
| Xenophon | Xenophon |
| Xenophon of Ephesus | Xenophon van Efese |
| Xenophontos monastery | Xenophon |
| Xenosauridae | Knobbelhagedissen |
| Xenotarsosaurus | Xenotarsosaurus |
| xenotransplantation | xenotransplantatie |
| Xenoturbella | Xenoturbellida |
| Xenu | Xenu |
| Xeon | Xeon |
| Xeraco | Xeraco |
| Xerces | Xerces |
| Xerez CD | Xerez CD |
| Xerinae | Grondeekhoorns |
| Xermade | Xermade |
| XeroBank Browser | Torpark |
| xerography | fotokopie |
| xerox | kopiëren |
| Xerox Alto | Alto |
| xerox copy | fotokopie |
| Xerta | Xerta |
| Xerxes | Xerxes |
| Xerxes I of Persia | Xerxes I |
| Xerxes II of Persia | Xerxes II |
| Xewkija | Xewkija |
| Xfce | Xfce |
| XGA | Extended Graphics Array |
| Xhosa | Xhosa |
| Xhosa language | Xhosa |
| Xhosa woman | Xhosavrouw |
| XHTML | Extensible HyperText Markup Language |
| XHTML Mobile Profile | XHTML Mobile Profile |
| xi | xi |
| Xi Andromedae | Adhil |
| Xi Cephei | Alkurhah |
| Xi Draconis | Grumium |
| Xi Geminorum | Alzirr |
| Xi Puppis | Azmidiske |
| Xi Ursae Majoris | Alula Australis |
| Xia | Xia-dynastie |
| Xia Dynasty | Xia-dynastie |
| Xiamen | Xiamen |
| Xianbei | Xianbei |
| Xianfeng Emperor | Xianfeng |
| Xiangfan | Xiangfan |
| Xiangkhoang Province | Khwaeng Xieng Khuang |
| Xianyang | Xianyang |
| Xicheng District | Xicheng-district |
| XIe arrondissement | XIe arrondissement |
| Xie Jun | Xie Jun |
| Xie Xingfang | Xie Xingfang |
| Xiehouyu | Chinese spreekwoorden |
| Xigazê Prefecture | Prefectuur Xigazê |
| Xihe | Xi en He |
| XIIe arrondissement | XIIe arrondissement |
| XIIIe arrondissement | XIIIe arrondissement |
| Xijiang River | Xi Jiang |
| Xin | Xin |
| Xin Dynasty | Wang Mang |
| Xindi | Xindi |
| Xingu | Xingu |
| Xingu River | Xingu |
| Xingyiquan | Xing Yi Quan |
| Xining | Xining |
| Xinjiang | Sinkiang |
| Xinjiangovenator | Xinjiangovenator |
| Xinzo de Limia | Xinzo de Limia |
| Xiongnu | Xiong Nu |
| Xipe Totec | Xipe Totec |
| Xirivella | Xirivella |
| Xishuangbanna Dai Autonomous Prefecture | Xishuangbanna |
| Xiuhtecuhtli | Xiuhtecuhtli |
| XIVe arrondissement | XIVe arrondissement |
| XIXe arrondissement | XIXe arrondissement |
| XL | XL |
| XLR connector | XLR |
| Xmas | Kerstmis |
| XML | Extensible Markup Language |
| XML Namespace | Naamruimte |
| XML Schema | XML Schema Definitietaal |
| XML Schema Definition | XML Schema Definitietaal |
| XMLHttpRequest | XMLHTTP |
| XMMS | XMMS |
