Tanja Mirjam Cecilia Lorentzon (née: Tanja Mirjam Cecilia Koukonen; 25 September 1971), previously known as Tanja Svedjeström, is a Swedish actress and dramatist of Finnish descent. Internationally, she is probably best known for her role of Sonja Modig in The Girl Who Played with Fire and The Girl Who Kicked the Hornets' Nest, film adaptations of the Millennium series by Stieg Larsson.