Sonia O'Sullivan is a retired Irish middle-distance runner, born on November 3, 1969, in Cobh, County Cork, Ireland. She is best known for her achievements in the 5,000 meters and 1,500 meters events. O'Sullivan won a silver medal at the 1996 Summer Olympics in Atlanta and secured multiple titles at the IAAF World Championships throughout her career. O'Sullivan set several national records and was a prominent figure in athletics during the 1990s. She also won gold medals at the European Championships and was a key competitor in various international competitions. Her contributions to the sport have made her a celebrated athlete in Ireland.