Maria Andersson Willner is a member of the Social Democratic Party, the ruling coalition in Sweden. She is a member of the Swedish Parliamentary Committee on Foreign Affairs and the Swedish Parliamentary Delegation to the Parliamentary Assembly of NATO. Andersson Willner has been active in politics since 2006. Before she was elected to the Swedish Riksdag in 2014, she studied to become a civics- and Swedish teacher. In November 2016, she was elected as Vice-President of the Board of Parliamentary Forum on Small Arms and Light Weapons.