Frank Smythson Limited, commonly known as Smythson (), is a British manufacturer and retailer of luxury stationery, leather goods, diaries, and fashion products based in London, England. The company's founder, Frank John Smythson, was born in 1847 at Holborn and was a son of Marcus Alfred Smythson, a professor of music. He opened his first store on 29 September 1887 at 133 New Bond Street in London. Smythson's current flagship store is located nearby at 131-132 New Bond Street.
Smythson's clients have included the current British royal family, Queen Victoria, many UK politicians and prime ministers, Sir Edmund Hillary, Madonna, and Grace Kelly. In 1908, the company created the first 'Featherweight' diary, enabling diaries to be carried about. Most of the company's leather goods are now made in Italy.

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