Undefeated is a 2011 American documentary film directed by Daniel Lindsay and T. J. Martin. The film documents the struggles of a high school football team, the Manassas Tigers of Memphis, as they attempt a winning season after years of losses. The team is turned around by coach Bill Courtney, who helps form a group of young men into an academic and athletic team.

Thomas McKay Martin Jr., known professionally as T. J. Martin, is an American filmmaker. Martin's film Undefeated (2011), for which he was co-director, co-editor, and co-cinematographer, won the 2012 Academy Award for Best Documentary Feature, making Martin the first film director of African-American descent to win an Academy Award for a feature-length film.