- X - The Problem of the Negro as a Problem for Thought
- X Saves the World
- X Troop
- X vs. Y
- X-Clusively Female: The Cyberspaces of the David Duchovny Estrogen Brigades.
- X-Radiography of Textiles, Dress and Related Objects
- X-Risk
- Xadrez De Humanas Palavras
- Xadrez à Luz do Sol
- Xeno-Punk
- Xenofeminism
- Xenolinguistics
- Xenophobia and Islamophobia in Europe
- Xenotropism and the Awakening of Literary Expatriatism through Writing Memoirs
- XI Costituzione di Damanhur
- Xi Jinping's Rise and Political Implications (Report)
- 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)