The Trials of Rosie O'Neill is an American drama television series which aired on CBS from September 17, 1990 to May 30, 1992. The show stars Sharon Gless as Fiona Rose "Rosie" O'Neill, a lawyer working in the public defender's office for the City of Los Angeles. The show marked the return of Gless to series television after her run on Cagney & Lacey.

Sharon Marguerite Gless is an American actress known for her television roles. She portrayed Maggie Philbin on Switch (1975–78), Sgt. Christine Cagney in the police procedural drama series Cagney & Lacey (1982–88), and played the title role in The Trials of Rosie O'Neill (1990–92). She was Debbie Novotny in the Showtime cable television series Queer as Folk (2000–2005) and Madeline Westen on Burn Notice (2007–2013).