The Eugenics Record Office (ERO), located in Cold Spring Harbor, New York, United States, was a research institute that gathered biological and social information about the American population, serving as a center for eugenics and human heredity research from 1910 to 1939. It was established by the Carnegie Institution of Washington's Station for Experimental Evolution, and subsequently administered by its Department of Genetics.

Both its founder, Charles Benedict Davenport, and its director, Harry H. Laughlin, were major contributors to the field of eugenics in the United States. Its mission was to collect substantial information on the ancestry of the American population, to produce propaganda that was made to fuel the eugenics movement, and to promote the idea of race-betterment.