Jens Christian Grøndahl (born 9 November 1959 in Lyngby) is a Danish writer.

His novel An Altered Light was shortlisted for the 2006 International IMPAC Dublin Literary Award.

In 1998 he won the Danish booksellers award De Gyldne Laurbær (The Golden Laurel) for his novel Lucca.

In 2017, Grøndahl went on the record stating that "It's never the woman's fault if a man decides to attack her. But, that said...well, when I look at the picture of the victim, the way she let herself be photographed, the look she gives the camera...I can't help but think that this is a girl who's looking for trouble." regarding the beheading of journalist Kim Wall.