Alfredo Pavlovsky (24 November 1907 – 26 April 1984) was an Argentinian physician who discovered that haemophilia has two types (A and B).^[1][2] Pavlovsky graduated with his medical degree in 1931, then worked as Bernardo Houssay's assistant professor in physiology.^[1] In 1947 he reported in Buenos Aires that "occasionally (in vitro) the blood of some of the haemophilic patients with a greatly prolonged clotting time ... when added to other haemophilic blood possessed a coagulant action nearly as effective as normal blood". This was later shown to be due to the blood of people with haemophilia B providing the clotting factor factor VIII to correct the defect in those with the more common haemophilia A.^[3]

Pavlovsky had five children and died in 1984.^[1]