Gossip Girl is an American young adult novel series written by Cecily von Ziegesar and published by Little, Brown and Company, a subsidiary of the Hachette Group (Hachette Livre). Narrated by the omniscient yet unseen blogger "Gossip Girl", the series revolves around the lives and romances amongst the privileged teenagers at the Constance Billard School for Girls, an elite private school in New York Citys Upper East Side. The series primarily focuses on Blair Waldorf and her best friend, "it girl" Serena van der Woodsen and follows the characters through their high school lives up through their graduation and moving on to college.

The first novel, Gossip Girl, was released in April 2002; the eleventh and final novel of the series was released in May 2007, with a prequel novel following in October 2007. Another follow-up novel, in which the characters return home from college for the holidays, is scheduled to be released in hardback format in November 2009. The original novel became the inspiration for the Gossip Girl (Gossip Girl (TV series)) teen drama television series, created by Josh Schwartz and Stephanie Savage, which premiered on The CW on September 19, 2007 and it is currently in its third season. In May 2008, a follow up series, Gossip Girl: The Carlyles, began publication, following the Carlyles triplets as they begin attending the Constance Billard School for Girls. As of May 2009, three novels have been released in this series. Ziegesar also created a spin-off series, The It Girl, which began publication in 2005.