Ellsberg is a surname. Notable people with the surname include:
Daniel Ellsberg (1931–2023), American military analyst and whistleblower Edward Ellsberg (1891–1983), American military writer Mary Carroll Ellsberg (born 1958), American epidemiologist Michael Ellsberg (born 1977), American author Robert Ellsberg (born 1955), American non-fiction writer
See also Ellsberg paradox Nathaniel A. Elsberg (1872–1932), New York politician