Ragnheiður Ragnarsdóttir, also known as Ragga Ragnars[1] (born 24 October 1984) is an Icelandic actress and former swimmer, who specialised in sprint freestyle events.[2] She is a multiple-time Icelandic record holder in both long and short course freestyle (both 50 metres and 100 metres). After retiring from swimming, Ragnheiður studied acting and played the role of Gunnhild on the TV series Vikings from 2018 to 2020.[1]