The biennial summit in April next year will take place in London and Windsor, west of the capital, and will be staged for the first time at Buckingham Palace.
The 90-year-old queen is the symbolic head of the Commonwealth and the 2018 summit might be the last one she attends in person, having discontinued long-haul travel for the summits.
As Britain leaves the European Union and becomes free to strike its own trade deals, it is openly looking to its historic partners in the Commonwealth and the 2018 summit will likely focus on commerce.
The Commonwealth brings together around a third of the world's population and a quarter of its countries, largely former territories of the British empire.
Disclaimer: No Business Standard Journalist was involved in creation of this content