Ruth Ann Sanger (6 June 1918 – 4 June 2001) was an Australian immunogeneticist, haematologist and serologist.
She was known for her work on human red cell antigens and for the genetic mapping of the human X chromosome.
She was Director of the Medical Research Council Blood Group Unit, of the Lister Institute of Preventive Medicine from 1973-1983.
She worked closely with Robert Russell Race from the 1940s, and they married in 1956.
They co-authored many papers after 1948, and co-wrote six editions of a leading work on blood groups, Blood Groups in Man, which helped make blood transfusions safer.
The book was known as "Race and Sanger", which were published between 1950 and 1975.