Mean Girls is a 2004 American teen comedy movie by Mark Waters. Written by Tina Fey, the script is based in part on the nonfiction book Queen Bees and Wannabe by Rosalind Wiseman, which describes how female social cliques work in high schools and what impact they can have on girls.

The film stars Lindsay Lohan and supporting cast are Rachel McAdams, Lacey Chabert, Amanda Seyfried.