| Isaac, only child of Abraham and Sarah |
| Isaac I. (1005–1061), Comnenus, Emperor of the East |
| Isaac II. (d. 1204), Angelus, Emperor of the East |
| Isaac of Antioch (d. 460), “One of the stars of Syriac literature” |
| Isabella II. (1830–1904), Queen of Spain |
| Isabella (1212–1228), Queen of Jerusalem |
| Isabella (1370–1435), wife of Charles VI. of France |
| Isabella (1451–1504), surnamed “the Catholic,” Queen of Castile |
| Isabella of Hainaut (1170–1190), Queen of France |
| Jean-Baptiste Isabey (1767–1855), French painter |
| Isaeus (c. 420–c. 350 B.C.), Attic orator |
| Isaiah, greatest and most influential of the Old Testament prophets |
| Ishmael, in the Bible, the son of Abraham by his Egyptian concubine Hagar |
| Isidore of Alexandria (fl. Fifth Century), Greek philosopher |
| Saint Isidore of Seville (d. 636), Spanish encyclopædist and historian |
| José Francisco de Isla (1703–1781), Spanish satirist |
| Ismail (1830–1895), Khedive of Egypt |
| Muḥammad Ismā‘īl (1781–1831), Mussulman reformer |
| Thomas Henry Ismay (1837–1899), British shipowner |
| Maximin Isnard (1758?–1825), French revolutionist |
| Isocrates (436–338 B.C.), Attic orator |
| Isaac ben Solomon Israeli (Ninth–Tenth Century), Jewish physician and philosopher |
| Jozef Israëls (1824–1911), Dutch painter |
| Issachar, Jacob’s ninth “son” |
| Israel Isserlein (1390–1460), German Talmudist |
| Moses ben Israel Isserles (c. 1525–1572), known as Remā |
| Isyllus, Greek poet |
| Hirobumi Itō (1841–1909), Japanese statesman |
| Agustín de Iturbide (1783–1824), Emperor of Mexico |
| Iulus, Roman legendary figure |
| Ivan, name of six grand dukes of Muscovy and tsars of Russia |
| Ívarr (d. c. 873), Danish leader |
| Sir James Ivory (1765–1842), Scottish mathematician |
| Tomomi Iwakura (1825–1883), Japanese statesman |
| Ralph Izard (1742–1804), American statesman |
| Alexander Petrovich Izvolsky (1856–1919), Russian statesman |
| Paul Jablochkov (1847–1894), Russian electrical engineer and inventor |
| Daniel Ernst Jablonski (1660–1741), German theologian |
| Andrew Jackson (1767–1845), seventh President of the United States |
| Cyril Jackson (1746–1819), Dean of Christ Church, Oxford |
| Frederick George Jackson (1860–1938), British Arctic explorer |
| Helen Hunt Jackson (1830–1885), American poet and novelist |
| Henry Jackson (1839–1921), English classical scholar |
| Henry Rootes Jackson (1820–1898), American soldier |
| James Jackson (1757–1806), American soldier |
| Mason Jackson (1819–1903), British engraver |
| Thomas Jackson (1579–1640), President of Corpus Christi College, Oxford, and Dean of Peterborough |
| Sir Thomas Graham Jackson (1835–1924), English architect |
| Samuel Macauley Jackson (1851–1912), American clergyman |
| Stonewall Jackson (1824–1863), American general |
| William Jackson (1730–1803), English musician |
| Jacob, father of the twelve tribes of Israel |
| John Jacob (1812–1858), Indian soldier and administrator |
| Jacob Ben Asher (c. 1269–c. 1340), Codifier of Jewish law |
| Jacob of Edessa (c. 640–708), Syriac writer |
| Jacob of Hungary (fl. 1251), French religious fanatic |
| Jacob of Jüterbogk (c. 1381–1465), Monk and theologian |
| Jacob of Sĕrūgh (451–521), one of the best Syriac authors |
| Carl Gustav Jakob Jacobi (1804–1851), German mathematician |
| Friedrich Heinrich Jacobi (1743–1819), German philosopher |
| Hermann Jacobi (1850–1937), German Sanskrit scholar |
| Johann Georg Jacobi (1740–1814), German poet |
| Friedrich Jacobs (1764–1847), German classical scholar |
| Joseph Jacobs (1854–1916), English critic and editor |
| Jens Peter Jacobsen (1847–1885), Danish imaginative writer |
| Jacobus de Voragine (c. 1229–1298), Italian chronicler, Archbishop of Genoa |
| Jacopo della Quercia (c. 1374–1438), Italian sculptor |
| Jean-Joseph Jacotot (1770–1840), French educationist |
| Joseph-Marie Jacquard (1752–1834), French inventor |
| Jacqueline (1401–1436), Countess of Holland |
| Jacques de Vitry (c. 1170–1240), French preacher of crusades, and a historian |
| Jagannath Shankarsett (1803–1865), Recognized leader of the Hindu community of Bombay |
| Gustav Jäger (1832–1917), German naturalist and hygienist |
| Richard Jago (1715–1781), English poet |
| Gottlieb von Jagow (1863–1935), German Foreign Secretary at the outbreak of the World War |
| Jahangir (1569–1627), Mogul Emperor of Delhi |
| Jāḥiẓ (d. 869), Arabian writer |
| Friedrich Ludwig Jahn (1778–1852), German pedagogue and patriot |
| Johann Jahn (1750–1816), German orientalist |
| Otto Jahn (1813–1869), German archæologist, philologist, and writer on art and music |
| Ludwig Heinrich von Jakob (1759–1827), German economist |
| Saint James, name of several persons mentioned in the New Testament |
| James I. (1566–1625), King of Great Britain and Ireland |
| James II. (1633–1701), King of Great Britain and Ireland |
| James I. of Scotland (1394–1437), King of Scotland and poet |
| James II. (1430–1460), King of Scotland |
| James III. (1451–1488), King of Scotland |
| James IV. (1473–1513), King of Scotland |
| James V. (1512–1542), King of Scotland |
| James I. (1208–1276), the Conqueror. King of Aragon |
| James II. (c. 1260–1327), King of Aragon |
| James II. (1243–1311), King of Majorca |
| James III. (1315–1349), King of Majorca |
| James (1688–1766), Prince of Wales |
| David James (1839–1893), English actor |
| George Payne Rainsford James (1801?–1860), English novelist |
| Henry James (1843–1916), Anglo-American man of letters |
| Henry, Baron James (1828–1911), English lawyer and statesman |
| John Angell James (1785–1859), English Nonconformist divine |
| Thomas James (c. 1573–1629), English librarian |
| William James (1780–1827), English naval historian |
| William James (1842–1910), American philosopher |
| Anna Brownell Jameson (1794–1860), British writer |
| Sir Leander Starr Jameson (1853–1917), British South African statesman |
| Robert Jameson (1774–1854), Scottish naturalist and mineralogist |
| George Jamesone (1589/90–1644), Scottish portrait-painter |
| Jāmī (1414–1492), Persian poet and mystic |
| John Jamieson (1759–1838), Scottish lexicographer |
| Robert Jamieson (c. 1780–1844), Scottish antiquary |
| Jane of Flanders (c. 1295–1374), French lady |
| Paul Janet (1823–1899), French philosophical writer |
| Jules Janin (1804–1874), French critic |
| Anneke Jans (1605–1663), Dutch heiress in New Amsterdam (New York) |
| Cornelius Jansen (1585–1638), Bishop of Ypres |
| Johannes Janssen (1829–1891), German historian |
| Jules Janssen (1824–1907), French astronomer |
| Abraham Janssens (1576?–1632), Flemish painter |
| Victor Honoré Janssens (1658–1736), Flemish painter |
| Cornelius Janssen van Ceulen (1593–1661), Flemish painter |
| Saint Januarius (d. 305), patron saint of Naples |
| Thomas Allibone Janvier (1849–1913), American author and journalist |
| Japheth, in the Bible, the youngest son of Noah |
| Jarīr ibn ‘Aṭīyah (d. 728?), Arabian poet |
| Nicolas Jarry (Seventeenth Century), French calligrapher |
| James Jackson Jarves (1818–1888), American critic and traveler |
| Abraham Jarvis (1739–1813), American Protestant Episcopal Bishop |
| Edward Jarvis (1803–1884), American author and physiologist |
| John Wesley Jarvis (1780–1840), American artist |
| Jacques Jasmin (1798–1864), Provençal poet |
| Jason of Cyrene (Second Century B.C.), Hellenistic Jew |
| William Jasper (1750–1779), American soldier |
| Marcus Jastrow (1829–1903), Polish-American rabbi |
| Morris Jastrow (1861–1921), American orientalist |
| Pierre Amédée Jaubert (1779–1847), French orientalist |
| Arnail François, Marquis de Jaucourt (1757–1852), French politician |
| Juan de Jáuregui y Aguilar (1583–1641), Spanish poet |
| Jean-Bernard Jauréguiberry (1815–1887), French admiral |
| Jean Jaurès (1859–1914), French Socialist leader |
| Abu Manṣūr Jawālīqī (1073–1145), Arabian grammarian |
| Jawharī (d. 1003?), Arabian lexicographer |
| John Jay (1745–1829), American statesman |
| John Jay (1817–1894), Antislavery activist |
| William Jay (1769–1853), English Nonconformist divine |
| John Cordy Jeaffreson (1831–1901), English author |
| Jean d’Arras (Fifteenth Century), Trouvère |
| Jean de Meun (c. 1240–c. 1305), French author |
| Jean de Venette (c. 1307–c. 1370), French chronicler |
| Pierre Jeannin (1540–1622), French statesman |
| Jean Paul (J. P. F. Richter) (1763–1825), famous German humorist |
| John Jebb (1736–1786), English divine |
| Sir Richard Claverhouse Jebb (1841–1905), English classical scholar |
| Jedaiah ben Abraham Bedersi (c. 1270–c. 1340), Jewish poet, physician and philosopher of Provence |
| Richard Jefferies (1848–1887), English naturalist and author |
| Joseph Jefferson (1829–1905), American actor |
| Thomas Jefferson (1743–1826), third President of the United States of America, and the most conspicuous apostle of democracy in America |
| Francis Jeffrey (1773–1850), Scottish judge and literary critic |
| George, Baron Jeffreys (1645–1689), Lord Chancellor of England |
| Jehoiachin, in the Bible, son of Jehoiakim and King of Judah |
| Jehoiakim, in the Bible, son of Josiah and King of Judah |
| Jehoram, name of two biblical characters |
| Jehoshaphat, in the Bible, son of Asa, and King of Judah |
| Jehu, in the Bible, a general and King of Israel |
| Sir Jamsetjee Jejeebhoy (1783–1859), Indian merchant and philanthropist |
| Sir Joseph Jekyll (1663–1738), English lawyer and master of the rolls |
| Josip Jelačić (1801–1859), Croatian statesman |
| John Rushworth, Viscount Jellicoe (1859–1935), British admiral |
| Adolf Jellinek (1821–1893), Jewish preacher and scholar |
| Georg Jenatsch (1596–1639), Swiss political leader |
| Fleeming Jenkin (1833–1885), British engineer |
| John Edward Jenkins (1838–1910), British author |
| Sir Leoline Jenkins (1623–1685), English lawyer and diplomatist |
| Robert Jenkins (fl. 1731–1745), English master mariner |
| Jeremiah Whipple Jenks (1856–1929), American economist |
| Edward Jenner (1749–1823), English physician and discoverer of vaccination |
| Sir William Jenner (1815–1898), English physician |
| Wilhelm Jensen (1837–1911), German author |
| Soame Jenyns (1704–1787), English author |
| Robert Jephson (1736–1803), British dramatist |
| Jephthah, in the Bible, one of the judges of Israel |
| William Jerdan (1782–1869), Scottish journalist |
| Jeremiah, in the Bible, the last pre-exilic prophet |
| Jeroboam, name of two kings in the Bible |
| Saint Jerome (d. 419/20), Doctor of the Church |
| Jerome Klapka Jerome (1859–1927), English author |
| Jerome of Prague (c. 1380–1416), early Bohemian church-reformer and friend of John Huss |
| Blanchard Jerrold (1826–1884), English author |
| Douglas William Jerrold (1803–1857), English dramatist and man of letters |
| Earls of Jersey |
| Jesse, in the Bible, the father of David |
| Edward Jesse (1780–1868), English writer on natural history |
| John Heneage Jesse (1815–1874), English historian |
| Sir George Jessel (1824–1883), English judge |
| Augustus Jessopp (1823–1914), British archæologist and author |
| Morris Ketchum Jesup (1830–1908), American banker and philanthropist |
| Jesus Christ |
| Jethro, Priest of Midian, in the Bible |
| William Stanley Jevons (1835–1882), English economist and logician |
| John Jewel (1522–1571), Bishop of Salisbury |
| Sarah Orne Jewett (1849–1909), American novelist |
| Geraldine Endsor Jewsbury (1812–1880), English writer |
| Sophia Jex-Blake (1840–1912), English medical practitioner |
| Jezebel, wife of Ahab |
| Rudolf von Jhering (1818–1892), German jurist |
| Francisco Jiménez de Cisneros (1436?–1517), Spanish Cardinal and statesman |
| Gonzalo Jiménez de Quesada (d. 1579), Spanish adventurer |
| Josef Jireček (1825–1888), Czech scholar |
| Joab, in the Bible, the son of Zeruiah, David’s sister |
| Joachim I. (1484–1535), Elector of Brandenburg |
| Joachim II. (1505–1571), Elector of Brandenburg |
| Joachim of Fiore (c. 1132–1202), Italian mystic theologian |
| Joseph Joachim (1831–1907), German violinist and composer |
| Saint Joan of Arc (1412–1431), the “Maid of Orléans” |
| Joan de Joanes (c. 1510–1579), head of the Valencian school of painters |
| Joanna I. (c. 1327–1382), Queen of Naples |
| Joanna II. (1371–1435), Queen of Naples |
| Joash, name of two kings of Palestine in the Bible |
| Job, Book of the Bible |
| Jobst (1354–1411), Margrave of Moravia |
| Étienne Jodelle (1532–1573), French dramatist and poet |
| Joel, second book among the minor prophets in the Bible |
| Manuel Joël (1826–1890), Jewish philosopher and preacher |
| Joseph Jacques Césaire Joffre (1852–1931), Marshal of France |
| Jules Joffrin (1846–1890), French politician |
| Saint Isaac Jogues (1607–1646), French missionary in North America |
| Joḥanan ben Zakkai (d. c. 80), Palestinian rabbi |
| Johann von Wesel (d. 1481), German theologian |
| Saint John, the Apostle |
| Saint John the Baptist, in the Bible, the “forerunner” of Jesus Christ |
| John, name of twenty-two popes |
| John I. (925–976), surnamed Tzimisces, East Roman Emperor |
| John II. (1087/8–1143), surnamed Comnenus and also Kalojoannes (John the Good), East Roman Emperor |
| John III. (1193–1254), surnamed Vatatzes and also Ducas, East Roman Emperor |
| John IV. (c. 1250–c. 1300), surnamed Lascaris, East Roman Emperor |
| John V. or VI. (1332–1391), surnamed Palaeologus, East Roman Emperor |
| John VI. or V. (c. 1292–1383), surnamed Cantacuzene, East Roman Emperor |
| John VI. or VII. (1390–1448), surnamed Palaeologus, East Roman Emperor |
| King John (1167–1216), King of England |
| John I. (1350–1395), King of Aragon |
| John II. (1397–1479), King of Aragon |
| John I. (1358–1390), King of Castile |
| John II. (1405–1454), King of Castile |
| John I. (b. and d. 1316), King of France |
| John II. (1319–1364), surnamed the Good, King of France |
| John III. (Sobieski) (1629–1696), King of Poland |
| John I. (1357–1433), King of Portugal |
| John II. (1455–1495), the Perfect, King of Portugal |
| John III. (1502–1557), King of Portugal |
| John IV. (1603–1656), the Fortunate, King of Portugal |
| John V. (1689–1750), King of Portugal |
| John VI. (1769–1826), King of Portugal |
| John (1801–1873), King of Saxony |
| John I. (1253–1294), Duke of Brabant and Lorraine, surnamed the Victorious |
| John (1290–c. 1320), surnamed the Parricide |
| John of Austria (1547–1578), natural son of the Emperor Charles V. |
| John of Austria (1629–1679), Recognized as the natural son of Philip IV., King of Spain |
| Saint John of Beverley (d. 721), English Bishop |
| John of Bohemia (1296–1346), King of Bohemia |
| John of Brienne (c. 1148–1237), King of Jerusalem and Latin Emperor of Constantinople |
| Saint John of Capistrano (1386–1456), Italian friar, theologian and inquisitor |
| Saint John of the Cross (1542–1591), Spanish mystic |
| Saint John of Damascus (d. before 754), eminent theologian of the Eastern Church |
| John of Ephesus (c. 507–586), a leader of the Monophysite Syriac-speaking Church |
| John of Garland (c. 1195–1272), Latin grammarian |
| John of Gaunt (1340–1399), Duke of Lancaster |
| John of Hexham (c. 1160–1209), English chronicler |
| Saint John of Nepomuk (c. 1340–1393), national saint of Bohemia |
| John of Ravenna |
| John of Salisbury (c. 1115–1180), English author, diplomatist and Bishop |
| John the Fearless (1371–1419), Duke of Burgundy |
| John the Steadfast (1468–1532), Elector of Saxony |
| John Albert (1459–1501), King of Poland |
| John Angelus (d. 1244), Emperor of Thessalonica |
| Augustus John (1878–1961), British painter |
| John Frederick I. (1503–1554), called the Magnanimous, Elector of Saxony |
| John Frederick (1529–1595), called der Mittlere, Duke of Saxony |
| John George I. (1585–1656), Elector of Saxony |
| Griffith John (1831–1912), Welsh missionary |
| John Maurice of Nassau (1604–1679), surnamed the Brazilian |
| John Zápolya (1487–1540), King of Hungary |
| Andrew Johnson (1808–1875), seventeenth President of the United States |
| Benjamin Johnson (1664/5–1742), English actor |
| Eastman Johnson (1824–1906), American artist |
| Herschel Vespasian Johnson (1812–1880), American statesman and jurist |
| Hiram Johnson (1866–1945), American politician |
| Isaac Johnson (1601–1630), English colonist in America |
| Oliver Johnson (1809–1889), American editor |
| Reverdy Johnson (1796–1876), American political leader and jurist |
| Richard Johnson (1573–c. 1659), English romance writer |
| Richard Mentor Johnson (1780–1850), ninth Vice-president of the United States |
| Rossiter Johnson (1840–1931), American author and editor |
| Samuel Johnson (1696–1772), American clergyman and educator |
| Samuel Johnson (1709–1784), English writer and lexicographer |
| Samuel Johnson (1822–1882), American clergyman |
| Sir Thomas Johnson (1664–1728), English merchant |
| Thomas Johnson (Eighteenth Century), English wood-carver and furniture designer |
| Sir William Johnson (1715–1774), British soldier and American pioneer |
| William Samuel Johnson (1727–1819), American jurist |
| Albert Sidney Johnston (1803–1862), American Confederate general in the Civil War |
| Alexander Johnston (1849–1889), American historian |
| Alexander Keith Johnston (1804–1871), Scottish geographer |
| Sir Henry Hamilton Johnston (1858–1927), British administrator, explorer and writer |
| Joseph Eggleston Johnston (1807–1891), American Confederate general in the Civil War |
| Mary Johnston (1870–1936), American historical novelist |
| Richard Malcolm Johnston (1822–1898), American author |
| William Preston Johnston (1831–1899), American educator |
| Arthur Johnstoun (1587–1641), Scottish physician and writer of Latin verse |
| Joinville, name of a French noble family of Champagne |
| Prince de Joinville (1818–1900), third son of Louis Philippe, duc d’Orléans, afterwards King of the French |
| Jean de Joinville (1224?–1317?), the second great writer of history in Old French |
| Mór Jókai (1825–1904), Hungarian novelist |
| Charles Joliet (1832–1910), French author |
| Louis Joliet (1645–1700), Canadian explorer |
| Sir Henri-Gustave Joly de Lotbinière (1829–1908), Canadian politician |
| Antoine Henri, Baron de Jomini (1779–1869), general and one of the most celebrated writers on the art of war |
| Niccolò Jommelli (1714–1774), Italian composer |
| Jonah, in the Bible, a prophet |
| Rabbi Jonah (c. 990–c. 1050), greatest Hebrew grammarian and lexicographer |
| Justus Jonas (1493–1555), German Protestant reformer |
| Jonathan, biblical name |
| Victorin Joncières (1839–1903), French composer |
| Alfred Gilpin Jones (1824–1906), Canadian politician |
| Sir Alfred Lewis Jones (1845–1909), British shipowner |
| Anson Jones (1798–1858), American statesman |
| Charles Colcock Jones (1831–1893), American lawyer and historical writer |
| Ebenezer Jones (1820–1860), British poet |
| Emily Elizabeth Constance Jones (1848–1922), English educator |
| Ernest Charles Jones (1819–1869), English Chartist |
| Henry Arthur Jones (1851–1929), English dramatist |
| Inigo Jones (1573–1651), English architect |
| John Jones (c. 1800–1882), English art collector |
| John Paul Jones (1747–1792), American naval officer |
| Michael Jones (d. 1649), British soldier |
| Owen Jones (1741–1814), Welsh antiquary |
| Owen Jones (1809–1874), British architect and art decorator |
| Richard Jones (1790–1855), English economist |
| Thomas Rupert Jones (1819–1911), English geologist and palæontologist |
| William Jones (1726–1800), English divine |
| Sir William Jones (1746–1794), British orientalist and jurist
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