John Treasure (20 June 1924 – 9 February 2004) was a leading figure in the British advertising industry in the 1960s, 70s and 80s.
He was chairman of J Walter Thompson in the UK while it was the country's number one agency, and then vice chairman of Saatchi & Saatchi when it in turn held the number one position; he was also Dean of City University Business School and Master of the Worshipful Company of Marketors.
He was a potent proponent of the economic and social value of his industry, and became known as "Mr Advertising."