Ida Marianne Vassbotn Klasson is a Norwegian actress, also credited as Marianne Vassbotn Klasson and Marianne Klasson. She made her screen debut in Joachim Trier's Reprise (2006) in a small supporting role, and has since appeared in a handful of Norwegian film and television productions over the following two decades. She is best known for Sissel Borg in Sentimental Value (2025), Elin in Homesick (2015), and Sykepleier (Nurse) in the TV miniseries 22. juli (2020, 3 episodes).

Her filmography includes Crimes of Passion: King Lily of the Valley (2013, as Dina), Homesick (2015, as Elin), Modus (2015, as Dharma), Ack Värmland (2015), Caliphate (2020, as Tine), 22. juli (2020, as Sykepleier), and Sentimental Value (2025, as Sissel Borg). Her Metacritic career score stands at 83, driven by the strong reception of Sentimental Value (86) and Reprise (79).