This publication summarizes the results of an IAEA coordinated research project on the application of wireless technologies in the nuclear industry. It provides an overview of the current knowledge, existing practices, operating experiences and benefits and challenges related to the use of the technology in instrumentation and control systems of nuclear facilities. The research areas covered were codes, standards and regulatory guides; wireless technologies for nuclear applications; practices, experience, lessons learned; potential wireless applications; and emerging technologies and challenges. The main part of the publication contains information derived from the results achieved in each research area. The annexes include supporting information and selected details of the research work that was performed. The information provided in this publication supports Member States' capabilities in the design, development, implementation, operation and, as necessary, licensing of wireless technologies in the nuclear industry.