Sanna Magdalena Mörtudóttir (born 3 May 1992) is an Icelandic politician.

[1] She is the leader of the Icelandic Socialist Party and has been a municipal representative on Reykjavík City Council since 2018.

In 2024, she was elected leader of the Icelandic Socialist Party and lead the party's list in the Reykjavík South constituency in the 2024 Icelandic parliamentary election.

Her parents met in England and Sanna grew up in London for her early years.

She broke the record as the youngest city representative in the history of Reykjavík.