- X
- 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-Men and Philosophy
- X-Plan Parenting
- X-Risk
- Xadrez De Humanas Palavras
- Xadrez à Luz do Sol
- Xander's Reasons / Jenna's Reasons
- Xangô, Meu Pai! O Orixá Rei
- Xavier Tilliette inedito
- Xavier Zubiri
- XCED Presents: Better Together
- Xcogitate
- Xeno-Punk
- Xenofeminism
- Xenofemminismo
- Xenolinguistics
- Xenophanes of Colophon
- Xenophobia and Islamophobia in Europe
- Xenophon's Socratic Education
- 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)
- Xin Xin Ming
- Xinjiang Population Dynamics and Data (English Edition)
- XIV Rapporto Sicurezza, qualità, accessibilità a scuola.
- XOXY
- Xperiment