Jack Karnehm (18 June 1917, Tufnell Park, north London – 28 July 2002, Crowthorne, Berkshire) was a British snooker commentator, who was regularly heard on BBC television from 1978 until 1994, and a former amateur world champion at the game of English billiards.

[1][2] Besides his commentary, perhaps his major contribution to snooker was his development of swivel-lens glasses, which enabled Dennis Taylor to continue playing the game at a professional level.

Karnehm, who had served a five-year spectacle-making apprenticeship, made many pairs in his family business, but his upside-down design was a considerable improvement, for it offered wider peripheral vision.

[2] Karnehm is perhaps best known for his one-liner when he was commentating on a match between Cliff Thorburn and Terry Griffiths at the Crucible Theatre in 1983.

As Thorburn lined up to pot the black, Karnehm uttered the words: "Good luck, mate".