Karin Tekla Maria Lannby (born 13 April 1916, Linköping – died 19 November 2007, Paris) was a Swedish actress, translator, journalist, poet and spy. She served as a spy for the leftists during the Spanish civil war, and for Sweden in Stockholm during World War II.
In 1939-1940, she lived with a budding film buff and stage director, almost ten years her junior, by the name of Ingmar Bergman. He also cast her in one of the lead roles of a Strindberg play, Pelikanen, in 1940. (