“Why I Killed My Best Friend” is a coming-of-age novel by Greek author Amanda Michalopoulou, first published in 2003. It tells the story of two childhood friends, Maria and Anna, as they navigate their teenage years and the social and political changes in Greece in the 1970s and 1980s. The novel explores themes of identity, sexuality, and the struggle for self-discovery. It has been praised for its honesty and use of multiple narrators. The book has been translated into several languages and is considered an important work by the author.