Date of Birth: 
Place of Birth: Killarney, Munster, Ireland
About Gillian O'Sullivan
- Gillian O'Sullivan (born 21 August 1976 in Killarney) is an Irish race walker.
- She set the unofficial world record in the 5000m walk in Belfast, United Kingdom since 2002 however, the IAAF have refused to verify it.
- She won a silver medal at the world championship in 2003 over 20km.
- It was the first time since 1995 that an Irish athlete had won a World Championship medal.
- Six years later in Berlin at the World Championships Olive Loughnane won silver at the same event as O'Sullivan. O'Sullivan was also the first Irish athlete to win a medal in the walk at an Athletics Championship.
- O'Sullivan was one of the main contenders for Ireland to win a medal in the Olympics in Athens in 2004 in the 20 km walk but suffered an injury just before the games that prevented her from taking part.
- O'Sullivan retired on April 19, 2007 after years of injuries. She now works as a personal trainer and runs a series of health, fitness and motivation talks in Cork.
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