Hal Downey (October 4, 1877 in State College, PennsylvaniaDOWNEY, Hal, in Who's Who in America (14th edition, 1926); p. 617–1959) was an American hematologist.

In 1923, he contributed to the characterization of reactive lymphocytes, which are sometimes called "Downey cells".

See also Allan Watt Downie

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