Yes, it is. The true story behind 'Ocean's 11' involved a group of men with military backgrounds who thought they could outwit the casino security in Las Vegas. They had a detailed plan much like in the movie, though the real - life version had its own set of challenges and differences. For example, the security measures in the actual casinos were different from what could be shown simply in a movie. And the relationships between the people involved in the real heist were complex, with various motives that led them to attempt such a daring plan.
Yes, 'Ocean's 11' is based on a true story. The original 1960 movie was inspired by a real - life heist attempt by a group of World War II veterans. They planned to rob multiple Las Vegas casinos at the same time.