Katharine Parker is a fictional character from the 1988 film Working Girl, portrayed by actress Sigourney Weaver. She is a high-powered executive in a New York City investment firm, known for her ambitious and competitive nature. Katharine serves as a mentor to the film's protagonist, Tess McGill, but her character also embodies the challenges women face in the corporate world. In the story, Katharine's character becomes a central figure in a plot involving deception and ambition. Her actions drive the narrative, highlighting themes of gender dynamics and the pursuit of success in a male-dominated environment. The film ultimately explores the complexities of professional relationships and personal integrity.