Alex Høgh Andersen (born 20 May 1994) is a Danish actor. He is mostly known for the role of Ivar the Boneless in the historical drama television series Vikings (2016–2020).
Andersen was born in the small town of Skælskør, in the western part of Sjælland (Zealand) in Denmark, the son of Thomas Andersen and Charlotte Høgh. He became very fond of acting during drama studies at school, rather than in other subjects. He participated in many musical plays and took some leading roles.
At the age of 17, Andersen decided he wanted to learn to act in front of a camera, and he went on to do Film and Media Studies at the University of Copenhagen (2014–2015). He started university in 2014, but dropped out in 2015 for the filming of Vikings on location in Ireland.