Antoine César Becquerel (1788–1878) – pioneer in the study of electric and luminescent phenomena
Henri Becquerel (1852–1908) – awarded the Nobel Prize in physics for his co-discovery of radioactivity
Carlo Beenakker (1960–) – professor at Leiden University and leader of the university's mesoscopic physics group, established in 1992.
Giovanni Battista Belzoni (1778–1823) – prolific Italian explorer and pioneer archaeologist of Egyptian antiquities[6]
Pierre-Joseph van Beneden (1809–1894) – Belgian zoologist and paleontologist who established one of the world's first marine laboratories and aquariums[7]
Claude Bernard (1813–1878) – physiologist who helped to apply scientific methodology to medicine
Jacques Philippe Marie Binet (1786–1856) – mathematician known for Binet's formula and his contributions to number theory
Jean-Baptiste Biot (1774–1862) – physicist who established the reality of meteorites and studied polarization of light
John Birmingham (astronomer) (1816–1884) – Irish astronomer who discovered the recurrent nova T Coronae Borealis and revised and extended Schjellerup's Catalogue of Red Stars[8]
Henri Marie Ducrotay de Blainville (1777–1850) – zoologist and anatomist who coined the term paleontology and described several new species of reptiles[9]
Raoul Bott (1923–2005) – mathematician known for numerous basic contributions to geometry in its broad sense[10][11]
Marcella Boveri (née O'Grady; 1863–1950) – biologist and first woman to graduate from the Massachusetts Institute of Technology, husband of Theodor Boveri
Theodor Boveri (1862–1915) – first to hypothesize the cellular processes that cause cancer
Louis Braille (1809–1852) – inventor of the Braille reading and writing system
Edouard Branly (1844–1940) – inventor and physicist known for his involvement in wireless telegraphy and his invention of the Branly coherer
Michel Chasles (1793–1880) – mathematician who elaborated on the theory of modern projective geometry and was awarded the Copley Medal
Guy de Chauliac (c. 1300–1368) – most eminent surgeon of the Middle Ages
Chien-jen Chen (1951–) – Taiwanese epidemiologist researching hepatitis B, liver cancer risk of people with hepatitis B, link of arsenic to blackfoot disease [zh], etc.[13]
Michel Eugène Chevreul (1786–1889) – considered one of the major figures in the early development of organic chemistry;[14] stated "Those who know me also know that born a Catholic, the son of Christian parents, I live and I mean to die a Catholic"[15]
Agnes Mary Clerke (1842–1907) – Irish astronomer and science educator
Mateo Realdo Colombo (1516–1559) – discovered the pulmonary circuit,[16] which paved the way for Harvey's discovery of circulation
Arthur W. Conway (1876–1950) – remembered for his application of biquaternion algebra to the special theory of relativity
E. J. Conway (1894–1968) – Irish biochemist known for works pertaining to electrolyte physiology and analytical chemistry[17]
Carl Ferdinand Cori (1896–1984) – shared the 1947 Nobel Prize in Physiology or Medicine with his wife for their discovery of the Cori cycle
Gerty Cori (1896–1957) – biochemist who was the first American woman win a Nobel Prize in science (1947)[18]
Gaspard-Gustave Coriolis (1792–1843) – formulated laws regarding rotating systems, which later became known as the Coriolis effect
Domenico Cotugno (1736–1822) – Italian anatomist who discovered the nasopalatine nerve, demonstrated the existence of the labyrinthine fluid, and formulated a theory of resonance and hearing, among other important contributions
Angélique du Coudray (c. 1712–1794) – head midwife at the Hôtel-Dieu, Paris, inventor of the first lifesize obstetrical mannequin, and author of an early midwifery textbook; commissioned by Louis XV to teach midwifery to rural women, she taught over 30,000 students over almost three decades
Maurice Couette (1858–1943) – best known for his contributions to rheology and the theory of fluid flow; appointed a Knight of the Order of St. Gregory the Great by Pope Pius XI in 1925[19]
Clyde Cowan (1919–1974) – co-discoverer of the neutrino
Jean Cruveilhier (1791–1874) – made important contributions to the study of the nervous system and was the first to describe the lesions associated with multiple sclerosis; originally planned to enter the priesthood
Endre Czeizel (1935–2015) – discovered that folic acid prevents or reduces the formation of more serious developmental disorders, such as neural tube defects like spina bifida
Gabriel Auguste Daubrée (1814–1896) – pioneer in the application of experimental methods to the study of diverse geologic phenomena[20]
Peter Debye (1884–1966) – awarded the Nobel Prize in Chemistry in 1936 "for his contributions to our knowledge of molecular structure through his investigations on dipole moments and on the diffraction of X-rays and electrons in gases."[21]
Piedad de la Cierva [1] (1903–2007) – Spanish scientist, pioneer in the study of artificial radiation in Spain and in the industrialization of optical glass.
Charles Enrique Dent (1911–1976) – British biochemist who defined new amino-acid diseases such as various forms of Fanconi syndrome, Hartnup disease, argininosuccinic aciduria and homocystinuria[22]
César-Mansuète Despretz (1791–1863) – chemist and physicist who investigated latent heat, the elasticity of vapors, the compressibility of liquids, and the density of gases[23]
Máirin de Valéra (1912–1984) Irish botanist; deeply Catholic, attending daily Mass whenever possible
Pierre Duhem (1861–1916) – historian of science who made important contributions to hydrodynamics, elasticity, and thermodynamics
Félix Dujardin (1801–1860) – biologist remembered for his research on protozoans and other invertebrates; became a devout Catholic later in life and was known to read The Imitation of Christ[24]
Jean-Baptiste Dumas (1800–1884) – chemist who established new values for the atomic mass of thirty elements
André Dumont (1809–1857) – Belgian geologist who prepared the first geological map of Belgium and named many of the subdivisions of the Cretaceous and Tertiary[25]
Charles Dupin (1784–1873) – mathematician who discovered the Dupin cyclide and the Dupin indicatrix[26]
E
Lennis Echterling – clinical psychologist and crisis interventionist
Stephan Endlicher (1804–1849) – botanist who formulated a major system of plant classification
Pierre de Fermat (1601–1665) – number theorist who contributed to the early development of calculus
Jean Fernel (1497–1558) – physician who introduced the term physiology
Fibonacci (c. 1170 – c. 1250) – popularized Hindu-Arabic numerals in Europe and discovered the Fibonacci sequence
Hippolyte Fizeau (1819–1896) – first person to determine experimentally the velocity of light[27]
Lawrence Flick (1856–1938) – American physician who pioneered research and treatment of tuberculosis
Emily Fortey (1866–1946) – British chemist and politician who investigated synthetic cyclohexane and cyclohexane in fractions of crude oil; converted to Catholicism in 1884
Paul Guthnick (1879–1947) – astronomer who pioneered the application of photoelectric methods to the measurement of the brightness of celestial bodies[29]
H
Samuel Stehman Haldeman (1812–1880) – American naturalist and convert to Catholicism who researched fresh-water mollusks, the human voice, Amerindian dialects, and the organs of sound of insects
Morgan Hebard (1887–1946) – American entomologist who described over 800 new species of orthopteroids and compiled an entomological collection of over 250,000 specimens
Eduard Heis (1806–1877) – astronomer who contributed the first true delineation of the Milky Way
Karl Herzfeld (1892–1978) – Austrian-American physicist who provided the first fundamental explanation of the mechanism of the absorption of sound by molecules[31]
Victor Franz Hess (1883–1964) – Austrian-American physicist, and Nobel laureate in physics, who discovered cosmic rays.
Karl Kehrle (1898–1996) – Benedictine Monk of Buckfast Abbey, England; beekeeper; world authority on bee breeding, developer of the Buckfast bee
Mary Kenneth Keller (c. 1914 – 1985) – Sister of Charity and first American woman to earn a PhD in computer science
Annie Chambers Ketchum (1824–1904) – convert to Catholicism and botanist who published Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis
Marie-Anne Paulze Lavoisier (1758–1836) – working with her husband, she instrumental to the standardization of the scientific method.
Claude-Nicolas Le Cat (1700–1768) – invented or perfected several instruments for lithotomy and was one of the first adherents of a mechanistic approach to physiology[36]
André Lichnerowicz (1915–1998) – French differential geometer and mathematical physicist considered the founder of modern Poisson geometry
Karl August Lossen (1841–1893) – geologist who mapped and described the Harz Mountains[37]
Jonathan Lunine (1959–) – planetary scientist at the forefront of research into planet formation, evolution, and habitability; serves as vice-president of the Society of Catholic Scientists[38]
M
William James MacNeven (1763–1841) – Irish-American physician and chemist who was an early proponent of atomic theory[39]
Pierre Louis Maupertuis (1698–1759) – known for the Maupertuis principle and for being the first president of the Berlin Academy of Science
Agnes McLaren (1837–1913) – Scottish physician who inspired other women to dedicate their medical knowledge to the care of the poor. First female to graduate as medical doctor from the University of Montpellier.
Michele Mercati (1541–1593) – one of the first to recognize prehistoric stone tools as man-made
Charles W. Misner (1932–) – American cosmologist dedicated to the study of general relativity
Charles Nicolle (1866–1936) – French bacteriologist who received the 1928 Nobel Prize in Medicine for his identification of lice as the transmitter of epidemic typhus; came back to the Catholic Church at the end of his life
Martin Nowak (1965–) – evolutionary theorist and Director of the Program for Evolutionary Dynamics at Harvard University; serves on the board of the Society of Catholic Scientists[38]
O
Niall Ó Glacáin (c. 1563–1653) – Irish physician who worked to treat victims of bubonic plague outbreaks in various places throughout Europe. He was a pioneer in pathological anatomy.
Karin Öberg (1982–) – her Öberg Astrochemistry Group discovered the first complex organic molecule in a protoplanetary disk; serves on the board of the Society of Catholic Scientists[38]
Abraham Ortelius (1527–1598) – created the first modern atlas and theorized on continental drift
Jean-Michel Oughourlian (1940–) – Armenian-French neuropsychiatrist and psychologist; President of the Association of Doctors of the American Hospital of Paris; honorary member of the Association Recherches Mimétiques
Paul Sabatier (chemist) (1854–1941) – awarded the Nobel Prize in Chemistry for his work improving the hydrogenation of organic species in the presence of metals
Horatio Storer (1830–1922) – physician; founder of the Gynaecological Society of Boston, the first medical society devoted exclusively to gynecology; leader of the "physicians' crusade against abortion"
Karl Stern (1906–1975) – German-Canadian neurologist and psychiatrist; lecturer in neuropathology and assistant neuropathologist at the Montreal Neurological Institute
Miriam Michael Stimson (1913–2002) – American Adrian Dominican Sister, chemist, and the second woman to lecture at the Sorbonne; played a role in the history of understanding DNA
Louis Jacques Thénard (1777–1857) – discovered hydrogen peroxide and contributed to the discovery of boron[55]
Leonardo Torres Quevedo (1852–1936) – Spanish civil engineer, inventor and mathematician who was a pioneer in automatic calculating machines and remote control.[56]
Leonardo da Vinci (1452–1519) – Renaissance anatomist, scientist, mathematician, and painter
Vincenzo Viviani (1622–1703) – mathematician known for Viviani's theorem, Viviani's curve and his work in determining the speed of sound
Alessandro Volta (1745–1827) – physicist known for the invention of the battery[58]
W
Wilhelm Heinrich Waagen (1841–1900) – geologist and paleontologist who provided the first example of evolution described from the geologic record, after studying Jurassic ammonites[59]
^Neuberger, Albert (1978). "Charles Enrique Dent, 25 August 1911 - 19 September 1976". Biographical Memoirs of Fellows of the Royal Society. 24: 15–31. doi:10.1098/rsbm.1978.0002.
^Sartori, Renzo. “Luigi Ferdinando Marsili, Founding Father of Oceanography.” In Four Centuries of the Word Geology. Ulisse Aldrovandi 1603 in Bologna, edited by Gian Battista Vai and William Cavazza. Bologna, Italy: Minerva Edizioni, 2003.
^Wilson Ross; Nancy Wilson Ross is the author of "Three Ways of Asian Wisdom: Hinduism, Nancy (December 16, 1984). "Thomas Merton's Pilgrimage". Washington Post. {{cite news}}: |last= has generic name (help)CS1 maint: multiple names: authors list (link)
