Marjut Heinonen (born October 28, 1976, in Trollhättan, Sweden) is a Finnish sport shooter. At age thirty-one, Heinonen made her official debut for the 2008 Summer Olympics in Beijing, where she competed in women's skeet shooting. She placed seventeenth in the qualifying rounds of the event, with a total score of 61 points.
Heinonen currently resides in Haapavesi, Finland, where she trains full-time at Haapaveden Ampumaseura, under her personal coach Rauli Honka.