Patrick Loudon Mollison, CBE, FRCP, FRS (17 March 1914 – 26 November 2011), was a British haematologist, described as 'the father of transfusion medicine'.

[1] His father was an ear, nose and throat surgeon at Guy's Hospital, and his paternal grandfather, William Loudon Mollison, was a Scottish mathematician and Master of Clare College, Cambridge.

[1] He joined the Royal Army Medical Corps in 1943, during World War II, serving in Germany and visiting the newly liberated Bergen-Belsen concentration camp.

He was Director of the Medical Research Council's Blood Transfusion Research Unit (later the Experimental Haematology Unit), from 1946 to 1979;[2] and Professor of Haematology at St Mary's Hospital, London from 1962 to 1979.

[2] Elizabeth II consulted him on each of her four pregnancies, and he was made a Commander of the Order of the British Empire (CBE) in the 1979 New Year Honours.