Jack Arnold Weyland (born 1940) is a retired professor of physics at Brigham Young University–Idaho (BYU–Idaho) and a member of the Church of Jesus Christ of Latter-day Saints. He is a prolific and well-known author of fiction for LDS audiences, including many novels and short stories, mostly placed in contemporary settings.

His novel Charly was made into a feature film in 2002. Jack Weyland is the best-selling author of young-adult fiction for the Latter-day Saint market. In fact, the modern genre of Latter-day Saint-themed popular fiction is one he is largely responsible for creating with his overwhelmingly popular novel Charly.

His interest in fiction began with a correspondence course in creative writing taken during a summer at BYU where he was doing research work. Since then, he has published more than two dozen books, and over fifty of his short stories have been published by the LDS Church magazine The New Era.

Born in Butte, Montana, Jack received a B.S. degree in physics from Montana State University and a Ph.D. in physics from BYU. Currently, he teaches physics at BYU-Idaho. He formerly taught physics at the South Dakota School of Mines and Technology.