William Van Zandt (born December 13, 1957) is an American playwright and actor, and author.

[3] Van Zandt is the co-author and star of the Off-Broadway plays You've Got Hate Mail, Silent Laughter, Drop Dead!, The Boomer Boys Musical, and 21 other theatrical plays written with Jane Milmore, including A Night at the Nutcracker, Wrong Window, and summer stock perennial Love, Sex, and the I.R.S.

Billy also wrote The Property Known as Garland for Adrienne Barbeau, which ran off-Broadway at the Actor's Playhouse in 2006.

In addition to starring in his own plays, he has had roles as Bob, one of the sailing teenagers, in Jaws 2 (1978), an alien Starfleet ensign in Star Trek: The Motion Picture (1979), a military school cadet in the 1981 film Taps, and a mobster wannabe in the 1999 film A Wake in Providence, which he also co-wrote.

[6] Two years after his marriage ended, Billy and actress Teresa Ganzel met during his Off-Broadway play You've Got Hate Mail and have been together ever since.