Carin Gerhardsen (born December 6, 1962 in Katrineholm, Sweden) is a Swedish author of crime fiction.

Originally a mathematician, Gerhardsen worked as an IT-consultant before becoming a full-time writer. Her mathematical knowledge is visible in her novels, which contain advanced calculated intrigues. Her popular book series The Hammarby Series, circles around Detective Inspector Conny Sjöberg and his team solving cruel and brutal murders in the southern parts of Stockholm. In 2012 her first novel in the series The Gingerbread House was released in America by the publishing house Stockholm Text.

Gerhardsen lives on Östermalm in Stockholm with her husband and children.