Kerstin Lundberg Hahn (born 22 April 1962) is a Swedish author of children's and youth books.
[1][2] Kerstin Lundberg Hahn grew up in Tavelsjö in Västerbotten.
She made her literary debut as a children's writer with the book Kajsa och fågeltjuvarna in 2000.
This marked the start of her series of detective stories about Kajsa and Johan.
She has also written several other books for children and youth, such as Vitas hemlighet (2010; illustrated by Maria Nilsson Thore) and the ghost story Skuggan i väggen (2012).