• Birthplace: Helsinki, Finland
• Age: 38
• Height: N/A
• Weight: N/A
• Website: N/A

Sanna Mirella Marin (Finnish pronunciation: ) (born 16 November 1985) is a Finnish politician who has been serving as the Prime Minister of Finland since 10 December 2019. A Social Democrat, she has been a member of the Parliament of Finland since 2015 and was the Minister of Transport and Communications between 6 June 2019 and 10 December 2019.

After Antti Rinne left his position as Prime Minister, the Social Democratic Party selected Marin as their new candidate for Prime Minister on 8 December 2019. Upon her confirmation by Parliament, Marin became, at age 34, both the world's youngest currently-serving state leader and Finland's youngest-ever prime minister. She is also the third female head of government of her country, after Anneli Jäätteenmäki and Mari Kiviniemi – both of whom were members of the Centre Party.

Marin was born on 16 November 1985 in Helsinki. She lived in Espoo and Pirkkala before moving to Tampere. Her parents split up when she was very young; the family faced financial problems and Marin's father struggled with alcoholism. After her parents separated, Marin was brought up by her mother and her mother's new female partner.

Marin graduated from the Pirkkala High School in 2004 at the age of 19. She graduated from the University of Tampere with a Master of Administrative Sciences in 2017.

Marin joined the Social Democratic Youth in 2006 and served as its first Vice President from 2010 to 2012.

Marin was a candidate in the 2008 Finnish municipal elections, but was not elected. She became active in politics from 2012. In the 2012 elections, she was elected to the City Council of Tampere at the age of 27 which was a breakthrough moment in her political career. She was the chairperson of the City Council from 2013 to 2017. In 2017, she was re-elected to the City Council. She is also a member of the Assembly of the Council of Tampere Region. She was also a member of the Pirkanmaa Regional Council from 2013 to 2016.

Marin was elected second deputy chairperson of the Social Democratic Party in 2014. In 2015 at the age of 30, she was elected to the Parliament of Finland as a MP from the electoral district of Pirkanmaa. Four years later, she was re-elected. On 6 June 2019, she became the Minister of Transport and Communications.

In December 2019, she was nominated by the Social Democratic Party to succeed Antti Rinne as the Prime Minister of Finland. Rinne was widely criticised over the way he handled a postal strike, but will remain the formal leader of the party at least until a convention in June 2020. She was narrowly preferred over her rival Antti Lindtman in a majority vote. Marin heads the Marin government formed by a five party coalition in which 12 out of 19 ministers in the cabinet are women. The Marin government continues with the same parties and the same government platform as the preceding Rinne Cabinet, with individual changes of portfolios.

Marin describes herself as coming from a rainbow family as she is the child of same-sex parents (two women). She was also the only child in her family and was the first person in her family to attend university. In January 2018, she had a daughter Emma with her husband Markus Räikkönen.