Editing Chatham House (section)

{{Short description|British think tank founded in 1920}}
{{for-multi|the school in Ramsgate|Chatham House Grammar School|the mansion in Virginia, United States|Chatham Manor}}
{{primary sources|date=September 2023}}
{{EngvarB|date=January 2022}}
{{Use dmy dates|date=October 2022}}
{{Infobox organisation
| name = Chatham House
| full_name = The Royal Institute of International Affairs
| logo = Chatham House Royal Institute of International Affairs.svg
| logo_alt = Chatham House, The Royal Institute of International Affairs
| image = Chatham House over the Jubilee weekend (7345325368).jpg
| caption = Entrance to Chatham House in 2012
| membership = 6,000 (approx.)
| headquarters = 10 [[St James's Square]]<br/>[[London]], England
| established = {{start date and age|1920}}
| website = {{URL|chathamhouse.org}}
| formerly = The British Institute of International Affairs
}}

'''The Royal Institute of International Affairs''', also known as '''Chatham House''', is a British [[think tank]] based in [[London]], England. Its stated mission is "to help governments and societies build a sustainably secure, prosperous, and just world". It is the originator of the [[Chatham House Rule]].