An Unreasonable Man is a 2006 documentary film that traces the life and career of political activist Ralph Nader, the founder of modern consumer protection in America and perennial presidential candidate.

Contrary to the title's apparent message, the film was actually created to defend and support Nader, and to restore his reputation after his controversial role in the 2000 U.S. presidential election.

The first half of the film examines Nader's advocacy for auto safety features, such as federally mandated seat belts and air bags, as well as his rise to national prominence following an invasion of privacy lawsuit against General Motors.

Over the next thirty years, the film argues, Nader "built a legislative record that would be the envy of any modern president."

The second half of the film traces Nader's shift to a grassroots form of organizing focused on citizen power, including his disillusionment with the two-party system following the rise of Reaganism.