Karin Ørnhøj Mortensen (born 26 September 1977) is a former Danish team handball player and two times Olympic champion. She received gold medals with the Danish national team at the 2000 Summer Olympics in Sydney and at the 2004 Summer Olympics in Athens, as well as the 2002 European Women's Handball Championship where she was awarded the MVP award for the tournament. She retired from the national team in September 2012. Having played 233 matches, she is the second most tenured player on the Danish Women's national team (second to Janne Kolling with 250 matches), and the most matches as Goalkeeper. During her handball career, she educated herself as a physiotherapist and today she has a clinic in Copenhagen. Additionally, she has worked sporadically as a handball expert on Danish television.