Jabir ibn Hayyan (c. 721–c. 815)

Jacob, François (1920–2013)

Jacobi, Karl Gustav Jacob (1804–1851)

Jacobs, Jane (1916–2006)

Jacobsen, Arne (1902–1976)

Jacquard, Joseph Marie (1752–1834)

Jaenisch, Rudolf

Jahn, Helmut (1940– )

James, William (1842–1910)

Janet, Pierre Marie Félix (1859–1947)

Jansky, Karl Guthe (1905–1950)

Janssen, (Pierre) Jules César (1824–1907)

Janyns, Henry (lived 15th century)

Jeans, James Hopwood (1877–1946)

Jelinek, Elfriede (1946– )

Jellicoe, Geoffrey Alan (1900–1996)

Jelliffe, Smith Ely (1866–1945)

Jencks, Charles (Alexander) (1939– )

Jenner, Edward (1749–1823)

Jenney, William Le Baron (1832–1907)

Jensen, (Johannes) Hans (Daniel) (1907–1973)

Jensen, Arthur R(obert) (1923–2012)

Jensen, Jens (1860–1951)

Jensen, Johannes Vilhelm (1873–1950)

Jerne, Niels Kaj (1911–1994)

Jessop, William (1745–1814)

Jiménez, Juan Ramón (1881–1958)

Jiřičnà, Eva (1939– )

Johannsen, Wilhelm Ludvig (1857–1927)

Johanson, Donald C(arl) (1943– )

John (VIII) Palaeologus (1390–1448)

Johnson Sirleaf, Ellen (1938– )

Johnson, Eyvind Olof Verner (1900–1976)

Johnson, Louise Napier (1940–2012)

Johnson, Philip Cortelyou (1906–2005)

Joliot-Curie, Frédéric (1900–1958)

Joliot-Curie, Irène (1897–1956)

Joliot-Curie, Irène (1897–1956) and Frédéric (1900–1958) (1900–1958)

Jones, E(uine) Fay (1921–2004)

Jones, Ernest (1879–1958)

Jones, Harold Spencer (1890–1960)

Jones, Inigo (1573–1652)

Jones, Mary Cover (1896–1987)

Jones, Owen Thomas (1878–1967)

Jones, Robert Trent, Sr (1906–2000)

Jordan, (Marie Ennemond) Camille (1838–1922)

Jordy, William H(enry) (1917–1997)

Joseph, Mother (1823–1902)

Josephson, Brian (David) (1940– )

Josephson, Brian David (1940– )

Jouhaux, Léon Henri (1879–1954)

Joule, James Prescott (1818–1889)

Joy, James Harrison (1882–1973)

Judd, Lewis Lund (1930– )

Jung, Carl Gustav (1875–1961)

Just, Ernest Everett (1833–1941)