The Foreign & Commonwealth Office is looking to appoint a conference production company to coordinate and deliver the 2014 Nato Summit, taking place at Celtic Manor Resort in Newport from 4-5 September 2014.
Services required include sponsorship, delegate facilities, catering, lighting and sound, broadcasting and temporary structures. The contract is worth between £5m and £6m.
The tender also calls for event services to deliver a supporting conference that will take place in the UK in the summer of 2014.
An e-tendering process will be used and the deadline for submissions is 25 March 2014.
Meanwhile, campaigners have revealed plans to stage an anti-war demonstration at the 2014 Nato Summit. A statement from the Stop the War coalition read: "Our protests in Wales next year will be expressing the point of view of the vast majority of people who want an end to these foreign wars and to the massive arms spending that goes with them. NATO has been at the forefront of disastrous wars in Afghanistan and Libya."
Britain last hosted the Nato summit 23 years ago. The last Nato summit was held in Chicago in 2012 and was attended by more than 14,000 people.