Ketill Björnsson, nicknamed Flatnose (Old Norse: Flatnefr), was a Norse King of the Isles of the 9th century.
Ketill Björnsson was the son of Björn Grímsson. In the Laxdoela saga he is recorded as being from Romsdal (Raumsdal), a valley in the county of Møre og Romsdal, between Nordmøre and Sunnmøre and from Sogn in the Landnámabók.
Most of Ketil's family eventually emigrated to Iceland. Ketil's wife was Yngvild Ketilsdóttir, daughter of Ketill Wether, a hersir from Ringerike. They had a number of children, including Bjorn Ketilsson, who lived at Bjarnarhofn; Helgi "Bjolan" Ketilsson, who lived at Esjuberg on Kjalarnes; Thorunn Ketilsdatter, wife of Helgi the Lean, the first settler in Eyjafjordur bay; and Jorunn Ketilsdatter. Ketill's daughter, Aud the Deep-Minded, married Olaf the White, King of Dublin. Their son, Thorstein the Red, briefly conquered much of northern Scotland during the 870s and 880s before he was killed in battle. Aud and many members of her clan settled in the Laxdael region of Iceland.
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