Ivar An Christensen (29 June 1868 – 17 January 1934) was a Norwegian ship owner. He was born in Mandal to Edmund Harris Christensen and Margrethe Rummelhoff. He established as ship broker in Haugesund in 1893, and by 1912 he was the largest ship owner in Haugesund, with a fleet of eleven steam ships. He relocated to Kristiania, and was a central person in Norwegian shipping. In 1920 three of his companies were merged to form Ivarans Rederi. Christensen was the first chairman of the Norwegian Automobile Federation, and was among the largest financial supporters of the establishment of Det Nye Teater.