Born in San Francisco but grew up in St. Paul, Minnesota.
Auditioned for Remember the Titans (2000).
Started a production company, Roulette Entertainment, with Elden Henson (Elden Ratliff).
Has three younger siblings: Jessica, Jake, and Joe.
He was caught supposedly robbing a Dairy Queen when he was 16 (he and his friends were actually making a short film).
He went to high school with actress Rachael Leigh Cook.
Was raised for the most part by his father, Daniel, and stepmother, Molly. His mother moved back to San Francisco after divorcing his father.
Josh also attended Cretin-Derham Hall in St. Paul Minnesota before attending South High School.
Josh was in a production of Tom Sawyer, he played the part of Huckleberry Finn.
Recently moved back to Minnesota (March 2002)
Quit football in high school because of an injured left knee.
One of Teen People's 25 Hottest Stars under 25 (2002)
Was scheduled to speak at a political rally in support of Senator Paul Wellstone the weekend the Senator was killed along with 7 others in a plane crash. On October 26th 2002 (the day after the Senator's death), Hartnett appeared at a peace rally in St. Paul, Minnesota and spoke a few words in rememberance.
Was set to star as Clark Kent/Superman in Wolfgang Petersen's Batman vs.Superman, but the project has been delayed until after Brett Ratner's X-Men film.
Is a vegetarian.
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