John Coger "Jackie" Martling, Jr. (born February 14, 1948) is an American stand-up comedian, writer, radio personality, author, and actor also known as "Jackie the Joke Man". He is best known as the former head writer for The Howard Stern Show from 1983 to 2001.
Born and raised on Long Island, New York, Martling began a career in stand-up comedy in 1979, developing a blue comedy act in local venues. He self-produced his first of three comedy albums during this time, What Did You Expect? (1979). After becoming involved with Rick Dees's radio show as a regular joke feature, Martling sent his albums to New York City radio personality Howard Stern, who invited him as a weekly guest and writer in 1983. This led to his hiring as head writer from 1986 to 2001. He released further albums during his tenure, including Sgt. Pecker (1996), Joke Man (1996), Hot Dogs + Donuts (1998). 
Since his departure from The Howard Stern Show, Martling has undertaken various projects, including acting roles in television and film, and continues to perform stand-up. From 2006 to 2014, he was the host of Jackie's Joke Hunt on Sirius XM Satellite Radio. He released his first music album, Happy Endings (2008). Martling has written two books, Disgustingly Dirty Joke Book (1998) and The Joke Man: Bow to Stern (2017).