David Berglas (30 July 1926 – 3 November 2023) was a British magician and mentalist. He was one of the first magicians to appear on UK television. In the 1950s, Berglas created what is now referred to as the "Holy Grail" of card magic, known as "The Berglas Effect." The effect was first named "The Berglas Effect" by Jon Racherbaumer in his 1984 book "At The Table" 