Jennifer McMahon (born 1968 in Hartford, Connecticut) is a novelist living in Barre , Vermont. She has a civil union with her partner, and one child.

Her debut novel, Promise Not to Tell, was published by Harper Paperbacks (an imprint of HarperCollins) in April 2007. Promise Not to Tell was described by Publishers Weekly as "Part mystery-thriller and part ghost story" Fiction Reviews: Week of 2/5/2007 - 2/5/2007 - Publishers Weekly. It was released in Germany by Rowohlt Verlag, under the title Das Mädchen im Wald (The Girl in the Woods), in October 2007. Orion Publishing Group published Promise Not to Tell in the United Kingdom in 2008.

Her follow up suspense novel, Island of Lost Girls was published by Harper Paperbacks in April 2008. It was a New York Times Bestseller. It was released in Germany by Rowohlt Verlag, under the title Die Insel der verlorenen Kinder (The Island of Lost Children); and in the Netherlands by De Boerkij, under the title Het eiland van de verdwenen meisjes (The Island of Missing Girls). Sphere, an imprint of Little, Brown, will publish it in the United Kingdom in September 2009.

Her next book from HarperCollins, Dismantled, was published in hardcover in June 2009.

McMahon also has a book of lesbian teen fiction, entitled My Tiki Girl, which was released by Dutton Children's (an imprint of Penguin Group) in May 2008. It was included in the American Library Association's 2009 Rainbow List .

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