- X - The Problem of the Negro as a Problem for Thought
- X and Why
- X Marks the Spot
- X Saves the World
- X vs. Y
- X-Clusively Female: The Cyberspaces of the David Duchovny Estrogen Brigades.
- X-Faktor
- X-Men and the Mutant Metaphor
- X-Radiography of Textiles, Dress and Related Objects
- X-Ray Fluorescence Spectrometry (XRF) in Geoarchaeology
- X-rays for Archaeology
- X-Rays, Spirits, and Witches
- X-Risk
- X-Veranstalter
- Xadrez De Humanas Palavras
- Xadrez à Luz do Sol
- The Xaripu Community across Borders
- Xeno-Punk
- Xenofeminism
- Xenofeminism
- Xenolinguistics
- Xenophobe's Guide to the Belgians
- Xenophobe's Guide to the Chinese
- Xenophobe's Guide to the Estonians
- Xenophobe's Guide to the French
- Xenophobe's Guide to the Icelanders
- Xenophobe's Guide to the Japanese
- Xenophobe's Guide to the Spanish
- Xenophobia and Islamophobia in Europe
- Xenophobia in South Africa
- Xenosophia and Religion. Biographical and Statistical Paths for a Culture of Welcome
- Xenotropism and the Awakening of Literary Expatriatism through Writing Memoirs
- XI Costituzione di Damanhur
- Xi Jinping's New Development Philosophy
- Xi Jinping's Rise and Political Implications (Report)
- Xiangsheng and the Emergence of Guo Degang in Contemporary China
- XIII Rapporto 2015 sicurezza, qualità, accessibilità a scuola
- Xiipúktan (First of All)
- Xinjiang
- Xinjiang and China's Rise in Central Asia - A History
- Xinjiang and the Chinese State
- Xinjiang and the Expansion of Chinese Communist Power
- Xinjiang in the Twenty-First Century
- Xinjiang Population Dynamics and Data (English Edition)
- XIV Rapporto Sicurezza, qualità, accessibilità a scuola.
- XL Love
- XML-based Content Management (Enhanced Edition)
- XR Case Studies
- Xu Xiake (1586-1641)
- Xuanzang
- Xund
- Xurt'an
- XXX - Il dizionario del sesso insolito
- XYZ
- Xénophobie business