Jay Gould (1836–1892) was an American financier and leading railroad developer and speculator.
Jay Gould may also refer to: Jay Gould II (1888–1935), his grandson, American real tennis player Jay M. Gould (1915–2005), statistician and epidemiologist Stephen Jay Gould (1941–2002), American biologist and author Jay Gould (entrepreneur) (born 1979), American tech entrepreneur