Märta Elisabeth Rehn (née Carlberg) (born 6 April 1935) is a former MP of the Swedish People's Party and the first female minister of defence in Finland. In the 1994 presidential elections she was narrowly defeated by Martti Ahtisaari.
Rehn was born on 6 April 1935 in Helsinki, Finland. She spent her childhood in Mäntsälä, where her father worked as a community medical doctor. Rehn went to a local school in Mäntsälä before entering a boarding school in Kauniainen.
Rehn received the degree of master of science in economics in 1957 and has honorary degrees in political science from both Hanken School of Economics and Åbo Akademi University. In the beginning of the 1960s Rehn was known to be the first person in Finland to import and market the plastic Tupperware containers.