Gísli Örn Garðarsson (born 15 December 1973) is an Icelandic actor and director. He is one of the founders of Vesturport, a theatre and film company based in Reykjavík, and is also sometimes a scriptwriter and producer. Before focusing on acting, he competed internationally as a gymnast.

Early life and education
Gísli Örn was born in Reykjavík but grew up in Oslo. His father, Garðar Gíslason, is a teacher; his mother, Kolbrún Högnadóttir, worked for the publisher Fróði. Gísli Örn finished school at Hamrahlið College in Hlíðahverfi and studied Sociology at the University of Iceland and West European Studies at the University of Oslo before completing training in drama at the Iceland Academy of the Arts. He had wanted to study drama in Oslo but failed to gain entry. For many years he was a gymnast, competing for the Icelandic, Norwegian, and Danish national teams and belonging to the elite Ármann club together with Guðjón Guðmundsson, who was national champion in his age group for several years; he considered becoming a gymnastics coach but found it unappealing.