Varjo is a Finnish company headquartered in Helsinki that develops high-resolution virtual and mixed reality headsets, software and services for professional training and simulation. Its XR-4 Series headsets, including a Secure Edition manufactured in Finland for classified environments, are used for pilot, vehicle crew, maritime and other military and aerospace training, alongside software such as Varjo Base, the Teleport smartphone scanning service and professional services.

The company was founded in 2016 by former Nokia and Microsoft product leaders and has offices in Helsinki, Arlington, Virginia and Munich. It reports that its technology is deployed in more than 120 defense programs worldwide and that most of its revenue comes from exports. Partnerships announced include Rheinmetall, REISER, BRUNNER, Inzpire, FORCE Technology, VRAI and Fynd Reality, and customers include the Ukrainian Armed Forces, Lockheed Martin and the European Space Agency.

Varjo has raised more than $100 million across multiple rounds from investors including Atomico, EQT Ventures, Lifeline Ventures, Volvo Cars Tech Fund, Tesi, Foxconn and THEON, and has received Business Finland and European Innovation Council funding. In 2025 it announced a EUR 44 million defense R&D program supported by a EUR 12 million Business Finland grant, and in 2026 it announced plans to move XR-4 production to its own facility in Finland.