- XENOLITH AB
- XIMES GmbH [Wien]
- XING AG
- XLAB
- XLAB d.o.o.
- XLIM
- XVR Simulation BV
- XWiki
- XWiki SAS [Paris, France]
- Xamax Consultancy Pty Ltd
- Xavier School of Management
- XenLink Co. Ltd.
- Xerox Company
- Xerox Research Centre Europe [Meylan]
- Xi'an Jiaotong University
- Xi'an Jiaotong-Liverpool University [Suzhou]
- Xi'an Research Institute of High Technology
- Xi'an Shiyou University
- Xi'an University of Science and Technology
- Xi'an University of Technology
- Xiamen University
- Xiangtan University
- Xidian Hangzhou Institute of Technology
- Xidian University
- Xidian-Wuhu Research Institute
- Xihua University
- Xilinx India Technology Services [Hyderabad]
- Xinjiang Academy of Agricultural Science
- Xinjiang Agricultural University
- Xinjiang Agricultural University [Ürümqi]
- Xinjiang Agriculture University
- Xinjiang Institute of Water Resources and Hydropower Research
- Xinjiang University
- Xinyang Normal University
- Xi’an Communications Institute
- Xi’an Institute of Optics and Precision Mechanics
- Xi’an Institute of Surveying and Mapping
- Xi’an Jiaotong-Liverpool University
- Xperi
- XtremeData
- XtremeData Technologies
- Xuzhou Medical University
- Xuzhou Normal University
- xFace e.U.
- xTech Ltd.