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People starting with L
2,64,356 profiles.
- Leonard DeLongaAmerican artist (1925-1991)
- Leonard DemboZimbabwean musician
- Leonard DemiAlbanian politician
- Leonard Deming
- Leonard DersjantDutch military officer (1877-1940)
- Leonard DickGerman actor
- Leonard DickCanadian screenwriter
- Leonard Diederichpolitician
- Leonard DiengdohPGDCA in Computer Application from St Anthonys College, Shillong
- Leonard DiepenbrockGerman television presenter
- Leonard DiggesBritish mathematician
- Leonard DiggesEnglish Hispanist and poet
- Leonard Digrisartist
- Leonard DillonJamaican singer and musician (1942-2011)
- Leonard DiMariaAmerican mobster
- Leonard DinnersteinAmerican historian
- Leonard DixonSouth African sprinter
- Leonard DobbinBritish chemist
- Leonard DobbinBritish politician
- Leonard DobczyńskiPolish sportsperson, sports coach and athletics competitor (1933-2014)
- Leonard DobreRomanian footballer
- Leonard DobrovolskyUkrainian physician
- Leonard Dodsonprofessional golfer (1912-1997)
- Leonard DollagaU.S. Navy admiral
- Leonard DommettAustralian conductor and music educator (1928–2006)
- Leonard DoncasterEnglish botanist, geneticist and university teacher (1877 –1920)
- Leonard DorofteiRomanian boxer
- Leonard DowellScottish footballer (born 1902)
- Leonard Downie, Jr.American journalist
- Leonard DrakeAmerican basketball player and coach (1954–2010)
- Leonard Drorychief officer of the Imperial Continental Gas Association in Berlin
- Leonard DrożdżewiczPolish notary
- Leonard DsouzaBCA in IT services from St Aloysius College, Honavar
- Leonard du Bus de GisigniesDutch politician
- Leonard DubackiPolish historian (1928–2018)
- Leonard DubkinAmerican writer and naturalist
- Leonard DudanDalmatian politician
- Leonard Dudeneyjournalist
- Leonard DudmanScottish cricketer, footballer, curler (1933-2004)
- Leonard DuhlAmerican psychiatrist
- Leonard DukeAustralian speed skater
- Leonard DunavantAmerican politician (1919-1995)
- Leonard DupontFrench naturalist (1796–1828)
- Leonard Durczykiewiczphotographer
- Leonard Duszeńko
- Leonard DyerAmerican inventor and patent attorney
- Leonard E Egederesearcher ORCID ID = 0000-0003-1546-1515
- Leonard E. AnderaAmerican politician from South Dakota
- Leonard E. Barrettjamaican-American professor
- Leonard E. BaumAmerican mathematician
- Leonard E. DaviesAmerican lawyer, civil rights activist, writer and painter
- Leonard E. H. WilliamsRecipient of the Distinguished Flying Cross (1919–2007)
- Leonard E. Laufeherpetologist
- Leonard E. LindquistAmerican politician (1912–2004)
- Leonard E. Newellmissionary, ethnologist
- Leonard E. OpdyckeAmerican aviation historian and author (1929–2023)
- Leonard E. ReaU.S. Marine Corps Major General
- Leonard E. ScottAmerican politician (1917-1986)
- Leonard E. YosweinAmerican politician (1920-2011)
- Leonard Earl HowzeAmerican actor
- Leonard EastmentAustralian politician
- Leonard Eckstein Opdycketranslator
- Leonard Edgar Couchmanelectrical engineer and lepidopterist
- Leonard Edgar Grinstedcomposer
- Leonard EdgcombeCanadian ships captain
- Leonard EdmondsonAmerican artist (1916–2002)
- Leonard Edward Bishop StrettonJudge and Royal Commissioner in the State of Victoria, Australia
- Leonard Edward MasonAmerican anthropologist
- Leonard Eektelevision director
- Leonard EilersAmerican storyteller (1898–1996)
- Leonard EisenbudAmerican physicist (1913-2004)
- Leonard Ekstrand
- Leonard ElliottAmerican actor
- Leonard ElliottNew Zealand cricketer (1900-1970)
- Leonard Elliott Elliott-BinnsBritish academic
- Leonard ElschenbroichGerman cellist
- Leonard EngelmanAmerican makeup artist
- Leonard Engvallpriest
- Leonard EnnsCanadian choir conductor, composer,and teacher (1948-)
- Leonard EnrightIrish hurler (1953-2018)
- Leonard Eric HinkelEnglish chemist and academic (1882–1962)
- Leonard Eric Newtonbotanist
- Leonard EricksonAmerican oncologist (1946-2013)
- Leonard Ernest BaylissEnglish physiologist (1900-1964)
- Leonard EronAmerican psychologist (1920–2007)
- Leonard Erskine HillBritish physiologist (1866-1952)
- Leonard EsakiaRussian actor and film director (1890-1969)
- Leonard EtelPolish jurist
- Leonard Etomusician
- Leonard Eugene DicksonAmerican mathematician (1874–1954)
- Leonard Eugene WalesAmerican judge
- Leonard EvansCanadian politician
- Leonard Everett FisherAmerican artist, creator of picture books (1924–2024)
- Leonard EvettsBritish stained glass artist (1909–1997)
- Leonard EwensAustralian mayor
- Leonard F. BeckerAmerican politician and businessman (1920-1991)
- Leonard F. BersaniAmerican politician
- Leonard F. Chapman, Jr.24th Commandant of the Marine Corps (1913–2000)
- Leonard F. FullerAmerican electrical engineer
- Leonard F. JarrettCanadian scouting leader
- Leonard F. MasonMarine Corps Medal of Honor recipient (1920-1944)
- Leonard F. McCollumAmerican oil and gas executive (1902-1993)
- Leonard F. MorseAmerican college president, minister (1891–1961)
- Leonard F. Schumann
- Leonard F. WalentynowiczUnited States Assistant Secretary of State
- Leonard F. WingUnited States Army (1893-1945)
- Leonard FageraasNorwegian ski jumper
- Leonard FahlanderSwedish politician (1819–1881)
- Leonard Fahlanderpsychiatrist
- Leonard FaircloughBritish businessman
- Leonard FairleyAmerican sportsperson and gridiron football player
- Leonard FalconeAmerican conductor, teacher, and euphoniumist (1899–1985)
- Leonard FarbsteinAmerican politician
- Leonard FarlingerCanadian film director, producer and screenwriter
- Leonard FaulknerCatholic archbishop (1926–2018)
- Leonard FeatherBritish-American jazz musician and jazz writer (1914–1994)
- Leonard FediYugoslav footballer
- Leonard FeeneyAmerican priest
- Leonard Feinwriter and educator (1934-2014)
- Leonard FellEnglish Quaker
- Leonard FentonBritish actor
- Leonard FenwickBritish health administrator
- Leonard FicPolish Catholic clergyman
- Leonard Fielding Naldergovernor
- Leonard Fieldswriter, producer, director (1900–1973)
- Leonard FiggBritish diplomat
- Leonard FilgateAmerican artist
- Leonard FindlayScottish physician
- Leonard FinkAmerican photographer
- Leonard Finsethnorwegian-American fiddler
- Leonard FințescuRomanian politician
- Leonard FirestoneAmerican diplomat
- Leonard FisherSouth African bishop (1881-1963)
- Leonard Fison BatesEnglish illustrator (1890-1957)
- Leonard FitzgeraldU.S. Army photographer
- Leonard FloydAmerican football player (born 1992)
- Leonard FluentoInformática in Design from National Institute of Design, New York City
- Leonard FogliaAmerican theatre director, librettist, and novelist
- Leonard FonsAmerican lawyer and politician (1903-1956)
- Leonard FordeIrish hurler
- Leonard ForemanAmerican author
- Leonard ForrerSwiss-born British historian (1869-1953)
- Leonard Forsberg
- Leonard ForslundSwedish painter (born 1959)
- Leonard ForsterBritish professor of German (1913–1997)
- Leonard Fosbrookearly settler in Tasmania, Australia (flourished 1803-1814)
- Leonard FournetteAmerican football player (born 1995)
- Leonard Franca Nogueiramixed martial arts fighter
- Leonard Francis LindoyAustralian chemist
- Leonard Francis TyrwhittBritish priest
- Leonard Frank
- Leonard Frank CoolingBritish soil mechanics pioneer
- Leonard Frank Fieldmilitary personnel
- Leonard Frank MearesAustralian writer
- Leonard Frank ReynoldsAustralian painter, illustrator and cartoonist (1897-1939)
- Leonard Frank SkeatsBritish painter (1874-1943)
- Leonard Frank SpathBritish paleomalacologist
- Leonard Frans Hubert Carl Rulandpolitician (1826–1903)
- Leonard FraserAustralian serial killer (1951–2007)
- Leonard Fredrik RääfSwedish writer (1786–1872)
- Leonard FreedAmerican documentary photojournalist (1929-2006)
- Leonard Freedmanpalaeoprimatologist
- Leonard FreemanAmerican television writer and producer (1920–1974)
- Leonard Freier
- Leonard Frejtagarchitect
- Leonard FrenchAustralian artist (1928-2017)
- Leonard FreyAmerican actor (1938–1988)
- Leonard FruytierDutch politician
- Leonard FryerEnglish artist
- Leonard FryerBritish artist, stamp and banknote designer (1891-1965)
- Leonard FuGerman violinist
- Leonard Fuchsfilm actor, television actor
- Leonard Fulton RossUnion Army general (1823-1901)
- Leonard FurberEnglish cricketer and British Army officer
- Leonard Furs-ŻyrkiewiczOfficer of the Polish Army
- Leonard G. Carr(1902-1976)
- Leonard G. DennisAmerican politician
- Leonard G. G. RamseyBritish antiquarian, writer, encyclopaedist and editor
- Leonard G. JohnsonAmerican inventor
- Leonard G. MontefioreBritish philanthropist and Jewish community leader
- Leonard G. MuseAmerican politician
- Leonard G. ShepardChief of the Revenue Cutter Service
- Leonard G. Usher
- Leonard G. WolfAmerican politician (1925-1970)
- Leonard G. Worleyarachnologist
- Leonard Gabriel Pociej
- Leonard GaetzCanadian politician (1841–1907)
- Leonard Galeprofessor of chemistry and mineralogy
- Leonard GansevoortAmerican politician (1751-1810)
- Leonard GarciaAmerican martial artist
- Leonard GardnerNovelist, short story writer, screenwriter
- Leonard GarmentAttorney (1924-2013)
- Leonard Garrett(1936-2011)
- Leonard Gascoigne BerryCanadian mineralogist (1914–1982)
- Leonard GaskinAmerican jazz bassist (1920–2009)
- Leonard GatesAmerican darts player
- Leonard Gatovdirector, theatre director
- Leonard GavriliuRomanian psychologist (1927-2018)
- Leonard GeardFootballer (born 1934)
- Leonard GeddesBritish clergyman
- Leonard GelukDutch politician
- Leonard Geoffrey Holmesmilitary personnel
- Leonard GeorgeCanadian actor (1946-2017)
- Leonard GeorgeAmerican football player
- Leonard GeorgeCanadian psychologist
- Leonard George Carr LaughtonBritish maritime historian
- Leonard George Casleyfounder of Principality of Hutt River (1925–2019)
- Leonard George ChapmanBritish engineer (1910-1975)
- Leonard George CorneyBritish colonial administrator (1886–1955)
- Leonard George Gossmilitary officer (1895–1988)
- Leonard George GreenBritish photographer
- Leonard George Jensen
- Leonard Gerard BoldinghDutch politician
- Leonard GersheAmerican writer (1922-2002)
- Leonard Gestrin
- Leonard Getzassociation football player
- Leonard GibbsAmerican musician (1948–2021)
- Leonard GibbsAmerican politician in New York (1800-1863)
- Leonard Gibsonassociation football player
- Leonard GibsonEnglish ballad writer
- Leonard Gilbertcricketer (1908-1974)
- Leonard Gilchrist WilsonCanadian-American historian of science
- Leonard GillespieBritish physician and surgeon
- Leonard GillettEnglish footballer
- Leonard GillmanAmerican mathematician and classical pianist (1917–2009)
- Leonard GirshmanRussian oculist
- Leonard GlabiszPolish economist
- Leonard GlasnovicSwedish taekwondoin
- Leonard GlasserAmerican cartoonist
- Leonard GlickAmerican anthropologist, historian and author
- Leonard GlińskiPolish Righteous Among the Nations
- Leonard GoffinéGerman writer
- Leonard Goldbergphysician, university teacher
- Leonard GoldbergAmerican film and television producer (1934-2019)
- Leonard GoldensonAmerican businessman (1905-1999)
- Leonard GoldsteinAmerican film producer (1903–1954)
- Leonard Goodercricketer (1876-1928)
- Leonard GoodwinBritish zoologist
- Leonard Goreckihistorian
- Leonard Goudhairestonemason
- Leonard GowShip owner and broker and art collector of Glasgow (1859-1936), living in West Princes St, Glasgow,
- Leonard GrahamEnglish cricketer (1901-1962)
- Leonard GrandellFinnish lieutenant general (1894-1967)
- Leonard Grandoin SEO and Content Writing from Kongunadu College of Arts and Science Coimbatore, New York City
- Leonard GravenGerman volleyball player
- Leonard GravesAmerican actor and singer
- Leonard GrayAmerican politician
- Leonard GrayAmerican basketball player (1951-2006)
- Leonard GrazioliSwiss handball player
- Leonard GreenBritish cricketer (1890-1963)
- Leonard GreeneAmerican inventor (1918-2006)
- Leonard GreeneGerman American-football player
- Leonard GreenwellBritish general
- Leonard GreenwoodEnglish cricketer (1899-1982)
- Leonard GreenwoodNew Zealand classicist (1880-1965)
- Leonard GreyIrish Gaelic footballer
- Leonard Greylouth Gaelic footballer
- Leonard Grey, 1st Viscount GraneLord Deputy of Ireland
- Leonard GribbleBritish crime writer (1908-1985)
- Leonard Grieve RobinsonCanadian politician and businessman
- Leonard GriffinAmerican soccer player
- Leonard GriffinAmerican football player
- Leonard GriffinAmerican baseball player
- Leonard Grigoryanmusical artist
- Leonard GrimesAfrican-American abolitionist and pastor
- Leonard Grobassociation football player
- Leonard GrospeFilipino high jumper
- Leonard GrossAmerican mathematician
- Leonard GrosvenorCanadian ice hockey player (1905-1981)
- Leonard Groth
- Leonard GroverAmerican playwright and theatrical manager
- Leonard Grundbergpolitician and Member of the parliament of Sweden (1842-1925)
- Leonard GrunsteinAmerican lawyer
- Leonard GruppoAmerican politician
- Leonard GudmundsenNorwegian composer
- Leonard Gula
- Leonard GurleGurle [Garrle], Leonard (c.1621–1685), gardener and nurseryman
- Leonard Guscott Haydonentomologist
- Leonard GustafsonCanadian politician
- Leonard GuthrieBritish physician (1858-1918)
- Leonard GuttridgeEnglish historian
- Leonard GwethCameroonian association football player
- Leonard GyldmarkDanish violinist
- Leonard GyllenhaalSwedish military officer and entomologist (1752 – 1840)
- Leonard Górkatheologian
- Leonard GórnickiPolish jurist
- Leonard H. EhrlichAmerican philologist (1924–2011)
- Leonard H. EicholtzAmerican civil engineer (1827 - 1911)
- Leonard H. KaserAmerican politican
- Leonard H. LavinAmerican businessman
- Leonard H. LeskoAmerican Egyptologist
- Leonard H. Nicholson
- Leonard H. PerrootsDirector of the Defense Intelligence agency
- Leonard H. Romecell biologist and biochemist
- Leonard H. StringfieldAmerican ufologist
- Leonard H. Tower, Jr.American activist
- Leonard H. Wheeler18 Apr 1811 - 25 Feb 1872
- Leonard H. Wilderscientific illustrator
- Leonard HaasPresident and chancellor of the University of Wisconsin-Eau Claire (1915-1998)
- Leonard HaberAmerican psychologist and politician
- Leonard HackneyAmerican judge
- Leonard HagströmSwedish politician (1881–1947)
- Leonard HaighEnglish rugby player (1880-1916)
- Leonard HainesBritish flying ace of WWII
- Leonard HakluytEnglish Member of Parliament (died 1413)
- Leonard Halford Dudley BuxtonBritish anthropologist
- Leonard HallEnglish journalist, trade unionist and socialit activist
- Leonard HallSouth African boxer
- Leonard Hallcontributor to Photoplay in 1929
- Leonard HalmrastCanadian politician
- Leonard Hamiltoncricketer (1862-1957)
- Leonard HamiltonAmerican basketball player and coach
- Leonard Hamilton Howard-Jonesmilitary personnel
- Leonard HammAmerican police commissioner
- Leonard HammondAmerican flying ace (1884-1945)
- Leonard Hampson RuddBritish clergyman
- Leonard Haning
- Leonard HankersonAmerican football player
- Leonard Hansongymnast (1887-1949)
- Leonard HanssenAmerican physicist
- Leonard HarahapBE BTech in Auditing from Universitas batam, Batam
- Leonard Harbaughcolonial-era American architect
- Leonard Harbincricketer (1915-2013)
- Leonard Harkiewiczsport cyclist
- Leonard HarperBritish cricketer (1880-1924)
- Leonard HarperNew Zealand politician (1832–1915)
- Leonard HarperAmerican producer, stager, and choreographer (1899-1943)
- Leonard HarrisAmerican philosopher
- Leonard HarrisAmerican football player
- Leonard HarrisAmerican critic, author, and actor (1929-2011)
- Leonard HarrisonAmerican businessman
- Leonard HarrisonRecipient of the George Cross
- Leonard HarshAmerican politician (1801-1866)
- Leonard HatfieldCanadian Anglican bishop and writer (1919–2001)
- Leonard HawkesBritish geologist (1891–1981)
- Leonard HayflickAmerican anatomist (1928–2024)
- Leonard Hazeltine Ihusband of Sarah Hart
- Leonard Hazeltine IIhusband of Emma Bogart
- Leonard HeatonCanadian pianist and music educator
- Leonard HelmAmerican revolutionary officer
- Leonard HemmingEnglish cricketer (1916-2010)
- Leonard HendersonAmerican judge (1772-1833)
- Leonard HendersonAmerican baseball player
- Leonard Hendrik Willem van SandickCivil servant in the Netherlands Indies
- Leonard Henly SimsAmerican politician (1807-1886)
- Leonard Henryplayer of American football
- Leonard Henry RochfordBritish flying ace (1896-1986)
- Leonard Henry Rumingcomedian and broadcaster
- Leonard Herbert EmsdenRoyal Flying Corps sergeant (1893-1917)
- Leonard HermansDutch politician
- Leonard HerzenbergAmerican geneticist and immunologist
- Leonard Herzenberglinguist (1934-2012)
- Leonard HigsonEnglish rugby league footballer
- Leonard HillAustralian politician (1886-1963)
- Leonard Hilltelevision producer
- Leonard HiltonAmerican athlete (1947-2000)
- Leonard HiltyAmerican football player, lineman, tackle (1896-1978)
- Leonard Hinkley19th century American politician
- Leonard HirschBritish musical artist and academic
- Leonard HjelmmanFinnish politician (1869-1952)
- Leonard HoHong Kong film producer (1925–1997)
- Leonard HoarAmerican academic administrator
- Leonard Hochberg
- Leonard HodgsonBritish scholar
- Leonard Hoffmann, Baron HoffmannBritish and South African judge (born 1934)
- Leonard HohenseePolish economist
- Leonard HokansonAmerican classical pianist (1931-2003)
- Leonard HolbrookRoyal Navy admiral
- Leonard HollandAmerican military officer
- Leonard HollandsBritish Army engineer
- Leonard HollidayLord Mayor of London, 1605 to 1606
- Leonard HollidayBritish diplomat (1910-1980). Commercial Counsellor, France 1948-1950, Commercial Counsellor, Switze
- Leonard Holmes A’Court, 4th Baron Heytesbury(1863-1949), Landowner
- Leonard HolmströmSwedish geologist, author, and folk high school director (1840-1919)
- Leonard HolterNorwegian karateka
- Leonard Holvy de PauwIndonesian badminton player
- Leonard HoogenboomDutch racing driver (born 2000)
- Leonard Hoopstourism industry
- Leonard HopkinsAustralian politician (1891–1950)
- Leonard Horndirector
- Leonard HorneBarbadian cricketer
- Leonard Hornemanengineer
- Leonard HornerMerchant, geologist and educational reformer
- Leonard HorowitzAmerican essayist
- Leonard HorridgeEnglish cricketer (1907-1976)
- Leonard Hosking TruranCeltic bard
- Leonard HowardBritish priest
- Leonard HowardAustralian cricketer (1886-1945)
- Leonard HoweAmerican hurdler
- Leonard HowellEnglish footballer (1848-1895)
- Leonard HowellJamaican Rastafari preacher (1898–1981)
- Leonard Hubert SimonsMilitary officer
- Leonard Hubert SticklandBritish biochemist
- Leonard HudzickiOfficer of the Polish Army (1899-1971)
- Leonard Hughes IVAmerican politician
- Leonard HumphriesAmerican football player
- Leonard HurstBritish distance runner (1871–1937)
- Leonard HusseyBritish explorer (1891–1964)
- Leonard HutchinsonMaster of University College, Oxford
- Leonard HutchinsonEnglish cricketer (1901-1976)
- Leonard HuttenBritish antiquarian
- Leonard HuxleyAustralian physicist (1902–1988)
- Leonard HuxleyBritish writer (1860-1933)
- Leonard Hylary ShebeskiCanadian geneticist
- Leonard Hyman Soichermathematician
- Leonard I. GarthAmerican judge
- Leonard I. GreenAmerican businessman
- Leonard I. SchiffAmerican scientist (1915–1971)
- Leonard I. Zonmedical researcher
- Leonard Iheagwamnigerian-British artist
- Leonard IngramsBritish banker (1900-1953)
- Leonard IngramsBritish opera manager
- Leonard InsullBritish ventriliquist
- Leonard IrbyEnglish Member of Parliament
- Leonard IrerihBEng Civil Engineering in Civil Engineering from University of benin,nigeria, Benin City
- Leonard Irvinecricketer (1906-1973)
- Leonard IrvingAmerican politician (1898-1962)
- Leonard IsaacsBritish-Canadian conductor and composer
- Leonard Isaacs Cadybotanist
- Leonard IsittMember of Parliament of New Zealand and Methodist minister (1855–1937)
- Leonard IsittNew Zealand air vice marshal (1891–1976)
- Leonard IssacsonAmerican composer and chemist
- Leonard Iwanowskitranslator, zoologist
- Leonard J Edwardsbureaucrat
- Leonard J. ArringtonAmerican Mormon historian
- Leonard J. CerulloAmerican neurosurgeon
- Leonard J. ChabertAmerican politician from Louisiana
- Leonard J. DeFrancisci
- Leonard J. FarwellAmerican politician (1819-1889)
- Leonard J. FickAmerican academic
- Leonard J. Greenspoontheologian
- Leonard J. HallAmerican politician
- Leonard J. JacobsAmerican politician
- Leonard J. MarcusAmerican activist
- Leonard J. MillerCanadian politician and businessman
- Leonard J. PełkaPolish linguist
- Leonard J. RussellBritish philosopher
- Leonard J. RussellAmerican mayor
- Leonard J. SouthAmerican cinematographer (1913-2006)
- Leonard J. SternAmerican judge (1904-1988)
- Leonard J. UmnusAmerican college sports coach
- Leonard J. van RhijnDutch reverend and author (1812–1887)
- Leonard J. WaksAmerican philosopher
- Leonard Jabrzemskiphotographer
- Leonard Jacksonactor (1928-2013)
- Leonard JacksonEnglish cricketer (1848-1887)
- Leonard Jacksonsport cyclist
- Leonard JacobiGerman jurist, lawyer and university lecturer (1832-1900)
- Leonard JacobsonAustralian writer
- Leonard JacobsonMuseum architect
- Leonard Jacques SteinBritish politician and barrister, prominent Zionist (1887-1973)
- Leonard JaczewskiPolish-Russian explorer, geographer, geologist, cartographer, and mining engineer (1858–1916)
- Leonard Jakob Ringerpolitician
- Leonard JakubowskiPolish singer
- Leonard James CrowleyCanadian catholic priest (1921-2003)
- Leonard James HooperGCHQ director
- Leonard James KeyworthEnglish soldier (1893–1915); recipient of the Victoria Cross
- Leonard James PottsEnglish academic and translator (1897–1960)
- Leonard James RogersBritish mathematician (1862-1933)
- Leonard James SpencerBritish mineralogist (1870–1959)
- Leonard James WallCanadian Roman-Catholic priest
- Leonard Jan Juszkiewiczpolitician
- Leonard Jan Józef Lepszyart historian, engineer
- Leonard Jan Le Vannmedical researcher (1915-1987)
- Leonard Jan Plemp van DuivelandDutch journalist (1868-1940)
- Leonard Januszko
- Leonard Jaroszewski
- Leonard JarvisAmerican politician (1781-1854)
- Leonard JeffriesAfrican-American academic known for Pan-African views
- Leonard Jennett SimpsonCanadian politician
- Leonard JenningsEnglish sculptor
- Leonard JenningsEnglish cricketer and Royal Air Force officer (1903-1977)
- Leonard JenynsEnglish clergyman and naturalist (1800-1893)
- Leonard JeromeAmerican financier and maternal grandfather of Winston Churchill (1817-1891)
- Leonard JervisBahamian sprinter
- Leonard JesurajB.Com in Commerce from Vidhyasagar College of Arts and Science, Chennai
- Leonard Jimmie SavageAmerican mathematician (1917–1971)
- Leonard Jodko-Narkiewiczengineer
- Leonard Johan SchippersCivil servant of the Netherlands Indies
- Leonard Johan WickstrømStatspolitiet, torturer
- Leonard Johannes SchmidtDutch military officer (1883-1961)
- Leonard Johanssonpolitician
- Leonard John BeestonBritish short story author and writer (1874-1963)
- Leonard John BrassAustralian-born American botanist (1900-1971)
- Leonard John CroninJournalist, editor, publisher
- Leonard John LewisBritish academic
- Leonard John RoseAmerican politician
- Leonard John SedgwickBritish botanist (1883-1925)
- Leonard JohnsonAmerican football player
- Leonard Johnsonprofessional baseball player
- Leonard JohnsonAmerican football player (born 1998)
- Leonard Johnston WillsBritish geologist
- Leonard JonesCanadian politician (1924–1998)
- Leonard Jonesdouble bass player
- Leonard Jonesfootballer
- Leonard Jones BassonSouth African politician
- Leonard JonkersDutch entrepreneur and politician
- Leonard Joseph HutchisonCanadian mycologist
- Leonard Joseph Lancelot AddisonBritish diplomat
- Leonard Joseph Raymondroman-catholic archbishop (1899-1974)