Siobhan Dervan-Horgan (born 22 December 1978) is an Irish former racing cyclist. She is a former Irish National Road Race Champion, a title which she won for four consecutive years from 2005 to 2008. Dervan finished 24th in the 2008 UCI Women's Road Race World Championships, an improvement on her 67th position the previous year. She did not finish the 2009 edition. In January 2011 she joined the Irish team pursuit squad in their bid to qualify for the 2012 Olympic Games. She has competed in a number of triathlons and placed 10th in the European Duathlon Championships in 2014.
Siobhan Dervan married John Horgan in January 2009.
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