The 50-year-old helmer is suing the website called Gawker for copyright infringement and contributory copyright infringement, reported Ace Showbiz.
He is seeking more than USD 1 million for unspecified damages and an injunction to stop the site from continuing to link to the script.
"Gawker Media has made a business of predatory journalism, violating people's right to make a buck. This time they've gone too far," Tarantino writes in his legal papers.
"Rather than merely publishing a news story reporting that Plaintiff's screenplay may have been circulating in Hollywood without his permission, Gawker Media crossed the journalistic line by promoting itself to the public as the first source to read the entire screenplay illegally," it further read.