Karen Dionne, (born 1953) is an American writer, whose internationally bestselling 2017 psychological suspense novel The Marsh King's Daughter was selected by Library Journal as one of the best thrillers of the year. The Marsh King's Daughter was recognized as the best book of 2017 by Suspense Magazine, which gave the book their "Crimson Scribe" award, the highest honor the magazine bestows. Translation rights have been sold in 25 languages.