Jasper Roy Blackall (20 July 1920 – between 2018 and 2020) was a British sailor. He won a bronze medal in the Sharpie class with Terence Smith at the 1956 Summer Olympics. He went on to form a graphic design company with Peter Cook and Rod Dew (Blackall, Cook and Dew) in 1961. Blackall was an illustrator and designer serving the advertising industry in London. Blackall died in Portugal sometime between 2018 and 2020.