Her Majesty acceded to the throne on 6 February 1952 when she was 25 years old, and her 70 years of service will be celebrated across the United Kingdom, the Commonwealth and around the world during 2022.
The Queen and members of the Royal Family will travel around the country during the year, undertaking a variety of engagements to mark the occasion, with the focal point being the Platinum Jubilee Weekend - an extended bank holiday, from Thursday 2 June to Sunday 5 June 2022.
Platinum Jubilee Weekend will be an opportunity for communities and people throughout the United Kingdom to come together to mark the historic milestone, with four days of celebrations including public events and community activities, as well as national moments of reflection on The Queen's 70 years of service.
See the full programme of Jubilee Weekend events co-ordinated by Buckingham Palace.
We'll be flying the Platinum Jubilee flag at County Hall on certain officially designated days and are supporting numerous initiatives and projects launched nationally to mark the Platinum Jubilee. The initiatives will be just some of the many ways that our residents and communities can get involved in the Jubilee and put their own mark on the celebrations.
If you're planning a street party, event, exhibition or other activity, make sure you register it so others can find out more. Your event will appear on an interactive map, along with all the details.
If you're planning an event you may wish to use the official Queen's Platinum Jubilee emblem, free to use by organisers of events and publicity connected to the Jubilee. Download The Queen's Platinum Jubilee emblem.
Don't forget to use the official hashtags when you're telling the world what you're doing on social media #HM70 #PlatinumJubilee.