NATO has awarded Lockheed Martin a $100 million-plus (£66 million) contract to build the network at its new headquarters in Brussels.
The contract includes options under which Lockheed Martin may also be contracted to maintain the NATO network for five years.
The network will be designed to support 4,500 users and up to 1,500 additional conference visitors.
Among the facilities Lockheed Martin will provide will be four integrated security networks interoperable with other NATO nations; cross domain information assurance solutions for secure, seamless interconnectivity; a high availability data centre; and unified communications and collaboration services.
Angela Heise, vice president of enterprise IT at Lockheed Martin information systems and global solutions, said: "We will create a modern network where personnel can use their preferred method of communication easily, reliably and securely - no matter what network, application or device they choose to use."
To deliver the project Lockheed will use a variety of suppliers including SELEX Elsag, Prodata Systems, Dell, Microsoft and Cisco.
Lockheed has previously been involved in network provision at the Pentagon, the Defense Information Systems Agency, the US Army Corp of Engineers and the US Air Force.
Last year NATO hired BT for a £39 million five-year contract to provide a communications network for the NATO Consultation, Command and Control Agency (NC3A). NC3A is responsible for delivering technology in support of NATO's global operations, and the BT network connects more than 70 locations.