Fiona Gallagher is a fictional character from the television series Shameless, which originally aired on Showtime. She is portrayed by actress Emmy Rossum and serves as the eldest sibling in the Gallagher family. Fiona takes on the role of caretaker for her younger brothers and sisters, often struggling to balance her responsibilities with her own personal challenges. Throughout the series, Fiona faces various obstacles, including financial difficulties and complicated relationships. Her character is known for her resilience and determination to provide for her family despite the chaotic environment they live in. Fiona's journey highlights themes of family, sacrifice, and the pursuit of a better life.