Encyclopedias, Almanacs, Transcripts, and Maps
- Xenophanes of Colophon (c. 570 BCE—c.475 BCE)
- Xenophon (Addendum)
- Xenophon (c. 430 BCE–c. 350 BCE)
- Xibe
- Xikrin
- Ximénez, Francisco (1666–1730)
- Xinca
- Xingu Reserve
- Xingu River
- Xochicalco
- Xochimilco
- Xokléng
- Xoraxané Romá
- Xul Solar, (1888–1963)
- Xunzi (fl. 295–238 BCE)
- Xuxa (1963–)
- Yacimientos Petrolíferos Fiscales (YPF)
- Yagua
- Yagul
- Yahi and Yana