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- C. Herschel (crater)C. Herschel is a small lunar impact crater that lies on the western part of Mare Imbrium.
- C. V. RamanIndian physicist (1888–1970)
- Cai LunChinese Han dynasty official and paper innovator
- Calcium chlorateCalcium chlorate is the calcium salt of chloric acid, with the chemical formula Ca(ClO3)2.
- Canadian AmericansAmericans of Canadian descent
- Candice ClarkCandice Clark is an American former slalom canoeist who competed in the 1970s. She was onc
- Carl BenzGerman designer and engineer (1844–1929)
- Carl CorrensGerman botanist and geneticist (1864–1933)
- Carl Gustav Jacob JacobiGerman mathematician (1804–1851)
- Carl Hansen OstenfeldCarl Emil Hansen Ostenfeld (born Carl Emil Ostenfeld-Hansen) (3 August 1873 – 16 January 1
- Carl LinnaeusSwedish biologist and physician (1707–1778)
- Carl RitterGerman geographer (1779–1859)
- Carl SaganAmerican scientist and science communicator (1934–1996)
- Carl von RosensteinCarl von Rosenstein (born Carl Aurivillius; 13 May 1766 – 2 December 1836) was the Church
- Carl von VoitCarl von Voit (31 October 1831 – 31 January 1908) was a German physiologist and dietitian.
- Caroline HerschelGerman-British astronomer (1750–1848)
- Carrier scatteringDefect types include atom vacancies, adatoms, steps, and kinks that occur most frequently
- Catadioptric systemOptical system where refraction and reflection are combined
- Cathodic protectionCorrosion prevention technique
- Centrifugal governorMechanism for automatically controlling the speed of an engine
- Cerion (gastropod)Cerion is a genus of small to medium-sized tropical air-breathing land snails, terrestrial
- Cerreto CastelloCerreto Castello was a comune (municipality) in the Province of Biella in the Italian regi
- Chamberlain (office)Person in charge of managing a household
- Chancery LaneChancery Lane is a one-way street that forms part of the western boundary of the City of L
- Charles Algernon ParsonsAnglo-Irish mechanical engineer and inventor (1854–1931)
- Charles BabbageEnglish mathematician, philosopher, and engineer (1791–1871)
- Charles HermiteFrench mathematician (1822–1901)
- Charles HirshbergCharles Hirshberg is an American journalist and sportswriter. He primarily writes for larg
- Charles K. KaoHong Kong electrical engineer (1933–2018)
- Charles LauritsenCharles Christian Lauritsen (April 4, 1892 – April 13, 1968) was a Danish-American physici
- Charles LyellScottish geologist (1797–1875)
- Chichester BellChichester Alexander Bell (1848 – 11 March 1924) was an Irish audio engineer and inventor.
- Chien-Shiung WuChinese-American physicist (1912–1997)
- ChloralChloral, also known as trichloroacetaldehyde or trichloroethanal, is the organic compound
- Christen C. RaunkiærChristen Christensen Raunkiær (29 March 1860 – 11 March 1938) was a Danish botanist, who w
- Christiaan HuygensDutch mathematician and physicist (1629–1695)
- Christian BohrDanish physician and professor of physiology
- Christian Wolff (philosopher)German philosopher (1679–1754)
- Clapham CommonClapham Common is a large triangular urban park in Clapham, south London, England. Origina
- Clarke MedalNatural sciences award
- Claude BernardFrench physiologist (1813–1878)
- Claude ShannonAmerican mathematician (1916–2001)
- Coiled coilStructural motif in proteins
- Combinatorial topologyMathematical subject
- Constantijn Huygens Jr.Constantijn Huygens Jr., Lord of Zuilichem (10 March 1628 – October 1697), was a Dutch sta
- Cormeilles-en-ParisisCormeilles-en-Parisis (French pronunciation: , literally Cormeilles in Parisis) is a commu