Derivative () is a 2005 Turkish drama film, written, produced and directed by Ulaà  Ã°naç based on a short story by Miguel de Cervantes, about the complicated relationships between three people who confess their thoughts each evening to the camera for a movie project. The film, which went on nationwide general release across Turkey on , won the Golden Orange for Best Film at the 42nd Antalya "Golden Orange" International Film Festival.
Nazñm (Güçlü Yalçñner) is a successful young Istanbul writer who is about to marry Süreyya (Gülçin SantñrcñoÃÂlu). Süreyya is not sure about Nazñm's love and so she asks her best friend Burcu (Beste Bereket) to seduce him in order to test his fidelity. Reluctantly Burcu complies and then she falls in love.