Frances Hook (1847–March 17, 1908) claimed that she, disguised as a man, enlisted as a soldier in the Union Army during the U.S. Civil War.

When she was three years old both of her parents died, leaving only her and her older brother, who brought her up until the start of the Civil War.

At the time the Civil War began, Hook and her brother were living in Chicago, Illinois.

[2] When Hook claimed to have enlisted in the Union Army she was fourteen years old, but says she told recruiters she was twenty-two.

Hook was so devastated by her brother's death that she could no longer bear to serve in the same regiment he had died in.

While being treated at the regimental hospital the doctor discovered her sex; she was discharged from the army and told to go home.

The officers who were in charge of sending her home alerted recruitment authorities, "advising them to be on the lookout for her trying to rejoin the service.

After her mother's death, on March 17, 1908, Maggie Dickson wrote to the War Department seeking confirmation of Frances Hook's military service.