20th-century American women biologists

American marine biologist and conservationist (1907–1964)

Italian neurologist (1909–2012)

American scientist and cytogeneticist

American biologist

Australian-American biological researcher

American molecular biologist

American zoologist, gorilla researcher (1932–1985)

American evolutionary biologist (1938–2011)

American molecular biologist and immunologist

American oceanographer

Hungarian–American scientist and inventor (1900–1995)

American geneticist (1861–1912)

American geneticist

American writer and journalist (1941–2022)

American botanist (1858-1934)

American ornithologist, birdwatcher, and nature writer (1863 – 1948)

American sexologist

U.S. botanist, botanical collector and scientific illustrator (1869–1963)

Canadian American botanist (1859-1953)

Hawaiian-American professor of botany, ethnobotanist and specialist in algology (1919-2010)

American plant biologist and geneticist (1955–2024)

American virologist

American microbiologist

Austrian American molecular and cell biologist and academic

American ichthyologist (1922–2015)

American marine biologist, politician and seventeenth governor of Washington (1914-1994)

American ornithologist (1883–1974)

German-American botanist (1898-1997)

American botanist (1844-1920)

American oceanographer, marine biologist

American microbiologist (born 1934)

U.S. botanist and botanical illustrator (1874–1971)

American carcinologist (1860–1943)

American heiress, philanthropist and billionaire (1912-1993)

American botanist (1856-1946)

American biologist

Macedonian American biochemist

American botanist (1880-1926)

Mexican-American botanist (1870–1938)

American botanist and botanical collector (1863-1951)

American scientist (1910-1993)

American biologist, zoologist, and herpetologist (1883-1955)

American biologist

American microbiologist (1895–1981)

American paleontologist

American botanist and landscape architect (1857-1940)

American botanist, physiologist and mathematician (1923-1989)

American geneticist (1909-2004)

American botanist, botanical collector, librarian and editor (1863-1955)

American biologist (born 1939)

American botanist (1897-1980)

American molecular biologist

American zoologist (1849-1934)

American botanist (1873-1968)

American herpetologist (1898-1968)

American artist, photographer, botanist and naturalist (1860-1940)

American birder (1931–1999)

German born U.S. botanist (1923–2013)

American Primatologist

American botanist