Pretty Little Liars

Pretty Little Liars is an American mystery teen drama television series based on the novel series of the same name written by Sara Shepard. Developed by I. Marlene King, the series was broadcast on Freeform between June 8, 2010, and June 27, 2017, comprising 160 episodes over seven seasons. Set in the fictional Rosewood, Pennsylvania, the plot follows five best friends whose secrets are consistently threatened by the anonymous "A", who begins harassing them after the disappearance of their clique leader. Troian Bellisario, Ashley Benson, Lucy Hale, Shay Mitchell, Sasha Pieterse, and Janel Parrish lead the ensemble cast, alongside Holly Marie Combs, Ian Harding, Bianca Lawson, Laura Leighton, Chad Lowe, Nia Peeples, Tyler Blackburn, and Andrea Parker.

After an initial order of 10 episodes, ABC Family ordered an additional 12 episodes on June 28, 2010. The ratings success of the first 10 episodes prompted the book series to be extended beyond the initial eight novels. Since its debut, the series has received mixed reviews from television critics, but remained a relative success for the network, garnering a large fandom. The series finale was viewed by an estimated 1.41 million viewers. It had the second-highest rating of any cable TV series that aired that night but received a lukewarm reception from both critics and audiences.

It is the first series in the Pretty Little Liars franchise, with the series having two spin-offs: Ravenswood and Pretty Little Liars: The Perfectionists, both of which were cancelled after one season. A fourth series titled Pretty Little Liars: Original Sin premiered on HBO Max in 2022, which focuses on a new cast of characters in a different setting.