No, The Green Mile is not a true story. It is a work of fiction written by Stephen King. The novel was first published in 1996 as a serial novel and later adapted into a film in 1999. The story is set in a Southern prison during the Great Depression and follows the lives of the guards and inmates on death row, particularly focusing on a mysterious inmate named John Coffey who possesses supernatural healing powers. While the story is not based on real events, it explores themes of justice, humanity, and the supernatural, which are common in Stephen King’s works.