Mari Jungstedt is a Swedish journalist and popular crime fiction author.

Jungstedt worked as a reporter on Swedish national public radio and television, and is still an occasional presenter on TV4's daily talk show Förkväll.

Her first three novels are set on the island of Gotland and feature Detective Superintendant Anders Knutas and the journalist Johan Berg. Two of her novels were filmed for Swedish TV, and her work has been translated into English by Tiina Nunnally.

Mari Jungstedt lives in Nacka, near Stockholm. Her husband comes from Visby, Gotland, and during the summer they stay on Gotland.