- X
- X Marks the Spot
- X Saves the World
- X Troop
- X vs. Y
- X-Men and Philosophy
- X-Men and the Mutant Metaphor
- X-Plan Parenting
- 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
- Xadrez De Humanas Palavras
- Xadrez à Luz do Sol
- Xander's Reasons / Jenna's Reasons
- Xangô, Meu Pai! O Orixá Rei
- The Xaripu Community across Borders
- The Xaripu Community across Borders
- Xavier Zubiri
- XCED Presents: Better Together
- Xcogitate
- Xenofeminism
- Xenofemminismo
- Xenolinguistics
- 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
- Xiangsheng and the Emergence of Guo Degang in Contemporary China
- 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)
- XML-based Content Management (Enhanced Edition)
- Xperiment
- Xperiment Guidebook
- XR Case Studies
- Xtreme Honda B-Series Engines HP1552
- Xu Xiake (1586-1641)
- Xuanzang
- Xunzi
- XXX - Il dizionario del sesso insolito
- Xénophobie business
- Xénophon - Oeuvres Complètes
- Xô Depressão
- X尋寶探險隊 (31) 靈木神主
- X尋寶探險隊 (32) 冒險王西格.波東