True crime continues to grip audiences around the world, and few stories are as chilling—or as captivating—as those based on real-life serial killers. From psychological thrillers to biographical dramas, these films dive deep into the disturbing minds behind some of history’s most infamous murderers. In this list, we rank the top 20 movies based on real serial killers, blending cinematic quality with factual inspiration to deliver the ultimate watchlist for true crime fans. Whether you're drawn to the macabre out of curiosity or fascination, these films reveal the darkest corners of human behavior—because sometimes, reality is more terrifying than fiction.