Scientists, inventors, and mathematicians
Notable peoplePoliticians and leadersScientists, inventors, and mathematiciansWriters and journalistsReligious figuresRevolutionaries and activistsPhilosophers and social scientistsWritersScientists, inventors and mathematiciansMusicians and composersPhilosophers, historians, political and social scientistsVisual artistsSports figuresMilitary leaders and theoristsRebels, revolutionaries and activistsEntertainersLeaders and politiciansExplorersDirectors, producers and screenwritersBusinesspeopleScientists and inventorsMathematiciansJournalistsArtistsMusiciansCriminalsFilmmakers
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- Oak Ridge, TennesseeCity in Tennessee, United States
- Ober-RamstadtOber-Ramstadt is a town in the Darmstadt-Dieburg district, in Hessen, Germany. It is situa
- Obstetric anesthesiologyObstetric anesthesia or obstetric anesthesiology, also known as ob-gyn anesthesia or ob-gy
- Octave ChanuteAmerican civil engineer and aviation pioneer, born in France
- OegstgeestOegstgeest (Dutch pronunciation: ) is a town and municipality in the province of South Hol
- Office of Defense MobilizationThe Office of Defense Mobilization (ODM) was an independent agency of the United States go
- Ole WormDanish scientist (1588–1654)
- Ole-Johan DahlOle-Johan Dahl (12 October 1931 – 29 June 2002) was a Norwegian computer scientist. Dahl w
- Olga LadyzhenskayaRussian mathematician (1922–2004)
- Olga Taussky-ToddAustrian and American mathematician (1906–1995)
- Olive Mary HilliardSouth African botanist (1925–2022)
- Oliver Ellsworth BuckleyOliver Ellsworth Buckley (August 8, 1887 – December 14, 1959) was an American electrical e
- Oliver HeavisideBritish mathematician and electrical engineer (1850–1925)
- Oliver LodgeEnglish physicist and electrical engineer (1851–1940)
- Oliver SacksBritish neurologist and writer (1933–2015)
- Olivia HookerAmerican psychologist, professor, and the last known survivor of the Tulsa race massacre
- OltenițaOltenița (Romanian pronunciation: ) is a city in Călărași County, Muntenia, Romania, on th
- Omphalos (book)Omphalos: An Attempt to Untie the Geological Knot is a book by Philip Gosse, written in 18
- Onsager–Machlup functionThe Onsager–Machlup function is a function that summarizes the dynamics of a continuous st
- Oort constantsThe Oort constants (discovered by Jan Oort) and are empirically derived parameters that ch
- Open problemUnsolved problem in science and mathematics
- Order of MeritDynastic order recognising distinguished service with the Commonwealth
- Order of the British EmpireBritish order of chivalry established in 1917
- Order of the Companions of HonourCommonwealth order
- Organization for Women in Science for the Developing WorldInternational organisation supporting women in science
- Osborne ReynoldsAnglo-Irish innovator (1842–1912)
- Oscar BunemanOscar Buneman (28 September 1913 – 24 January 1993) made advances in science, engineering,
- Oskar PilotyOskar Piloty (30 April 1866 – 6 October 1915) was a German chemist.
- Ostwald color systemIn colorimetry, the Ostwald color system is a color space that was invented by the Baltic
- Ostwald–Freundlich equationThe Ostwald–Freundlich equation governs boundaries between two phases; specifically, it re
- Oswald VeblenAmerican mathematician (1880–1960)
- OswaldtwistleTown in Lancashire, England
- Other ranks (UK)Other ranks (ORs) in the Royal Marines (RM), the British Army, and the Royal Air Force (RA
- Othniel Charles MarshAmerican paleontologist (1831–1899)
- Otto HaxelOtto Haxel (2 April 1909, in Neu-Ulm – 26 February 1998, in Heidelberg) was a German nucle
- Otto Heinrich WarburgGerman physiologist and Nobel laureate (1883–1970)
- Otto LilienthalGerman aviation pioneer (1848–1896)
- Otto SternGerman–American physicist (1888–1969)
- Otto von GuerickeGerman scientist, inventor, and politician (1602–1686)
- Ottomar AnschützGerman inventor and photographer (1846–1907)
- Overpeck, OhioOverpeck (other names: Overpeck Station, Overpecks, Overpecks Station) is an unincorporate
- Owen ChamberlainAmerican physicist (1920–2006)
- Owen RichardsonBritish physicist (1879–1959)