Jack Avis (July 27, 1921- January 8, 2004) a British close-up magician and inventor. A printer by profession, he served in the British army over in Africa and Italy.
At one time he performed under the stage name Siva, which is Avis spelled backwards.
He created the Siva count card sleight.
- 1998 Vis a Vis with John Derris published by Richard Kaufman
- 2002 Ahead of the Pack with Lewis Jones*.
- 2006 Rara Avis Jack Avis by Anthony Brahams Sixty Years of Magic from the Private Notebooks of Jack Avis.