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- K. Alex MüllerSwiss physicist (1927–2023)
- K. Eric DrexlerAmerican engineer (born 1955)
- K. Ferdinand BraunGerman physicist (1850–1918)
- Kai SiegbahnSwedish physicist (1918–2007)
- KaleidoscopeOptical instrument to view patterns due to repeated reflection
- KalgoorlieCity in Western Australia
- Kalinga PrizeUNESCO science award
- Kalyar PlattBurmese herpetologist and conservationist
- Kantorovich theoremThe Kantorovich theorem, or Newton–Kantorovich theorem, is a mathematical statement on the
- Karen AsheAmerican academic
- Karen C. JohnsonAmerican physician
- Karen ChinAmerican paleontologist and taphonomist
- Karen ScrivenerMaterial scientist specialised in cement and concrete
- Karen SteelBritish scientist
- Karen UhlenbeckAmerican mathematician (born 1942)
- Karen VogtmannAmerican mathematician
- Karen VousdenBritish medical researcher
- Karen WynnCanadian psychologist
- Karimat El-SayedEgyptian academic
- Karisoke Research Center1°28′25″S 29°29′07″E / 1.4736°S 29.4854°E
- Karissa SanbonmatsuAmerican structural biologist
- Karl Barry SharplessAmerican chemist and Nobel Laureate (born 1941)
- Karl DraisGerman inventor (1785–1851)
- Karl Ernst von BaerBaltic German scientist (1792–1876)
- Karl Guthe JanskyAmerican physicist and radio engineer (1905–1950)
- Karl LandsteinerAustrian immunologist (1868–1943)
- Karl RubinAmerican mathematician (born 1956)
- Karl SchwarzschildGerman physicist (1873–1916)
- Karl Theodor Ernst von SieboldProf Karl (Carl) Theodor Ernst von Siebold FRS(For) HFRSE (16 February 1804 – 7 April 1885
- Karl von FrischGerman-Austrian ethologist (1886–1982)
- Karl WeissenbergKarl Weissenberg (11 June 1893, Vienna – 6 April 1976, The Hague) was an Austrian physicis
- Kármán–Howarth equationIn isotropic turbulence the Kármán–Howarth equation (after Theodore von Kármán and Leslie
- Kármán–Moore theoryKármán–Moore theory is a linearized theory for supersonic flows over a slender body, named
- Karmella HaynesAmerican biomedical engineer
- Kary MullisAmerican biochemist (1944–2019)
- Kat ArneyKatharine Luisa Arney is a British science communicator, broadcaster, author, and the foun
- Katalin KarikóHungarian-American biochemist (born 1955)
- Katalin SusztakHungarian-American nephrologist
- Kate Campbell Hurd-MeadAmerican gynecologist
- Kate ZwaardAmerican technologist
- Katharine BanhamEnglish clinical psychologist
- Katharine BishopAmerican anatomist, physician and histologist
- Katharine Blodgett GebbieAmerican astrophysicist (1932–2016)
- Katharine BluntAmerican chemist (1876–1954)
- Katharine HayhoeCanadian atmospheric scientist
- Katharine WayAmerican physicist (1902–1995)
- Katherine EsauGerman-American botanist (1898–1997)
- Katherine JohnsonAmerican mathematician (1918–2020)
- Katherine NelsonAmerican psychologist
- Katherine SanfordAmerican cell biologist
- Kathleen AntonelliIrish–American computer programmer (1921–2006)
- Kathleen BasfordBritish botanist and geneticist (1916–1998)
- Kathleen BoothBritish computer scientist (1922–2022)
- Kathleen I. PritchardCanadian oncologist
- Kathleen LonsdaleBritish crystallographer and activist (1903–1971)
- Kathrin Barboza MárquezBolivian biologist (born 1983)
- Kathryn Grove ShippAmerican organic chemist (1904–1977)
- Kathryn ZoonAmerican immunologist
- Katia and Maurice KrafftFrench volcanologists
- Katie Mack (astrophysicist)American theoretical cosmologist
- Katsuko SaruhashiJapanese geochemist (1920–2007)
- Kay BehrensmeyerAmerican taphonomist and paleoecologist
- Kay WarrenAmerican anthropologist
- Kaye WellingsCo-founder of NATSAL
- Kazumi MakiKazumi Maki (kanji: 真木 和美, kana: まき かずみ Maki Kazumi, January 27, 1936, Takamatsu, Japan –
- Keith Bostic (software engineer)Keith Bostic (born July 26, 1959) is an American software engineer and one of the key peop
- Kelly JemisonAmerican geologist
- Kelsey MartinKelsey Martin is a professor of biological chemistry, psychiatry and biobehavioral science
- Ken KutaragiJapanese engineering technologist and businessman (born 1950)
- Ken ThompsonAmerican computer scientist known for Unix (born 1943)
- Kenjiro TakayanagiJapanese pioneer in the development of television (1899–1990)
- Kenneth G. WilsonAmerican theoretical physicist (1936–2013)
- Kenneth GreisenKenneth Ingvard Greisen (24 January 1918 in Perth Amboy, New Jersey – 17 March 2007 in Ith
- Kenneth W. FordKenneth William Ford (born May 1, 1926) is an American theoretical physicist, teacher, and
- KensingtonDistrict within the Royal Borough of Kensington and Chelsea in central London
- Kerrie MengersenAustralian statistician
- KhoniKhoni (Georgian: ხონი) is a town in the Western Georgian region (mkhare) of Imereti with t
- Kinross-shireThe County of Kinross or Kinross-shire is a historic county and registration county in eas
- Kip ThorneAmerican physicist, writer, and Nobel Laureate (born 1940)
- Kitagata, UgandaKitagata is a town in Western Uganda. It is one of the urban centers in Sheema District.
- Kitasato ShibasaburōJapanese physician and bacteriologist (1853–1931)
- Kitty JoynerAmerican electrical engineer (1916–1993)
- Klara LöbensteinGerman mathematician (1883–1968)
- Klara NahrstedtComputer scientist
- Klaus von KlitzingGerman physicist (born 1943)
- Kleene–Brouwer orderIn descriptive set theory, the Kleene–Brouwer order or Lusin–Sierpiński order is a linear
- Klein–Nishina formulaIn particle physics, the Klein–Nishina formula gives the differential cross section (i.e.
- Knight BachelorTitle indicating a knight not part of an order of chivalry
- Koblenz (region)Koblenz was one of the - at last - three Regierungsbezirke of Rhineland-Palatinate, German
- Kolmogorov–Arnold–Moser theoremThe Kolmogorov–Arnold–Moser (KAM) theorem is a result in dynamical systems about the persi
- Kong Tai HeongChinese-Hawaiian physician
- Konstantin NovoselovRussian–British physicist
- Konstantin TsiolkovskyRussian scientist (1857–1935)
- Köping, SwedenKöping is a locality and the seat of Köping Municipality in Västmanland County, Sweden. It
- Körber European Science PrizeThe Körber European Science Prize is a science and technology award, presented annually by
- Krassimira DaskalovaBulgarian historian
- Krista Kostial-ŠimonovićCroatian physician and academic
- Kristen GhodseeAmerican ethnographer and professor
- Kristen NygaardNorwegian computer scientist and mathematician
- Kristine FrenchAustralian plant biologist
- Kristine YaffeKristine Yaffe is an American Cognitive decline and dementia researcher. She is the Scola
- Kronecker's lemmaIn mathematics, Kronecker's lemma (see, e.g., Shiryaev (1996, Lemma IV.3.2)) is a result a
- Kummer theoryIn abstract algebra and number theory, Kummer theory provides a description of certain typ
- Kunihiko KodairaJapanese mathematician (1915–1997)
- Kwang Hwa ChungSouth Korean physicist (born 1948)
- Kyoto Prize in Advanced TechnologyThe Kyoto Prize in Advanced Technology is awarded once a year by the Inamori Foundation. T