Rethink Afghanistan is a 2009 documentary by Robert Greenwald and Brave New Films, about the US military presence in Afghanistan following the terrorist attacks of September 11, 2001.

Produced and released eight years into the war, at a time when Congress was considering sending tens of thousands of new troops to Afghanistan, the film asks the American public to reconsider basic questions about the conflict, such as how much will it cost, in lives and money? How long will Americans troops be there? How do we know if we’ve won? What is our exit strategy?

The film was initially made available for free, online, in six consecutive chapters. This staggered release allowed the filmmakers to stay atop an ever-changing news cycle. Greenwald characterized it as "the first real-time documentary."