Lady Blue is an American detective and action-adventure television series. Produced by David Gerber, it originally aired for one season on the American Broadcasting Company (ABC) network from September 15, 1985, to January 25, 1986. It was picked up by ABC after its pilot aired as a television film on April 15, 1985. The show revolves around Chicago detective Katy Mahoney (Jamie Rose) and her violent methods of handling cases. The supporting cast includes Danny Aiello, Ron Dean, Diane Dorsey, Bruce A. Young, Nan Woods, and Ricardo Gutierrez. Johnny Depp also guest-starred on the series in one of his earliest roles. With cinematography by Jack Priestley, the episodes were filmed on location in Chicago. Television critics noted Lady Blue's emphasis on violence, calling Mahoney "Dirty Harriet" (after Clint Eastwood's character Dirty Harry). Rose said she joined the project after being drawn to its genre. She prepared for the role by watching Eastwood's films, received advice from Eastwood on how to handle a gun, and practiced at a shooting range.

After the pilot aired, Lady Blue was criticized by several watchdog organizations (particularly the National Coalition on Television Violence) as the most violent show on television. ABC moved the series from Thursdays to Saturdays before cancelling it in early 1986, partially due to the complaints about excessive violence. Critical reception to the series was primarily negative during its run, but television studies author Cary O'Dell questions whether that stemmed from contemporary sexism. Lady Blue has not been released on DVD, Blu-ray, or an online streaming service. The series' rights are owned by Metro-Goldwyn Mayer, but there are no plans for future home releases.