Sanna Mirella Marin is a Finnish former politician who served as prime minister of Finland from 2019 to 2023 and as the leader of the Social Democratic Party of Finland (SDP) from 2020 to 2023. She was a Member of Parliament from 2015 to 2023. She was re-elected as member of parliament in April 2023 but resigned from her position in the Finnish parliament to become a strategic adviser on political leaders' reform programmes in the Tony Blair Institute in September 2023.

The Social Democratic Party of Finland is a social democratic and pro-European political party in Finland. It is the third largest party in the Parliament of Finland with 43 seats. Founded in 1899 as the Workers' Party of Finland, the SDP is Finland's oldest active political party and has a close relationship with the Central Organisation of Finnish Trade Unions. It is also a member of the Party of European Socialists, Progressive Alliance, Socialist International and SAMAK.