Kjartan (Icelandic: [ˈcʰar̥tan]; Faroese: [ˈtʃʰaɻ̊ʈan]; Norwegian: [çɑːɻtan]) is a masculine given name found in the Nordic countries, most prominently in Iceland and Norway. The Old Norse name Kjartan was a shortening of Mýrkjartan, from Old Irish: Muirchertach, the name of an Irish king whose daughter Melkorka (Old Irish Mael Curcaigh, "servant of Curcach") was brought to Iceland as a slave.^[1] The Irish name Muirchertach, meaning "mariner", is modernised to Muircheartach, anglicised as Murtagh.^[2]

Kjartan may refer to:

• Kjartan Finnbogason (born 1986), Icelandic international football player
• Kjartan Fløgstad (born 1944), Norwegian author
• Kjartan Gunnarsson (born 1951), Icelandic politician and lawyer
• Kjartan Haugen (born 1975), Norwegian cross-country skier and Paralympic gold medallist
• Kjartan Kristiansen (born 1963), Norwegian guitarist and backing vocalist in band DumDum Boys
• Kjartan Ólafsson (disambiguation), various people
• Kjartan Poskitt (born 1956), English author and television presenter
• Kjartan Salvesen (born 1976), Norwegian pop singer
• Kjartan Sturluson (born 1975), Icelandic international football goalkeeper
• Kjartan Sveinsson (born 1978), Icelandic keyboardist of the band Sigur Rós
• Kjartan the Cruel, a fictional character in The Last Kingdom television series and The Saxon Stories books