William George (Bill) Crampton (5 May 1936 – 4 June 1997) was a British vexillologist. His chief legacy, the Flag Institute, has hundreds of members in the UK and overseas. He was recognised as Britain's foremost authority on flags by government agencies, the flag trade, the media, publishers, librarians and vexillologists of all ages and backgrounds. He served as a president of Fédération internationale des associations vexillologiques, the International Federation of Vexillological Associations.
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