Joel Rapp was an American writer and director.

Rapp's first writing credit was on a 1954 episode of CBS's Topper, starring Robert Sterling and Anne Jeffreys. He also wrote for such shows as Highway Patrol, Lassie, Colt .45, and M Squad before the end of the decade.

His résumé also included installments of The Jim Backus Show, Peter Loves Mary, The Patty Duke Show, The Joey Bishop Show, Green Acres, The Lucy Show, The Flying Nun, and Bewitched.

He left writing in 1969 to go into the indoor plant business.

Known as "Mr. Mother Earth, Plant Man to the Stars," Rapp spent 11 years with Regis Philbin and Kathie Lee Gifford as the gardener on their morning TV show and wrote 14 books on indoor gardening and cooking. He also spent more than a decade giving gardening advice on WABC radio in New York.

Rapp died September 15, 2021 in Beverly Hills, California. He was 87.