Biörn Ivemark (1925 – 8 May 2005) was a Swedish pediatrician and pathologist.
He is credited with characterizing asplenia with cardiovascular anomalies, also sometimes known as "Ivemark syndrome".Born in Karlstad, Ivemark graduated from Karolinska Institutet (with a med.lic.
degree) in 1951 and received his research doctorate in 1955.He died at Carcassonne, in southern France, in 2005.