Namesakes
Belgian Prime Ministers:
3 prime ministers
Joseph Lebeau (middle name Louis) 1831; 1840-1841 
Jules Renkin (middle name Louis) 1931-1932
Joseph Pholien (middle name Louis) 1950-1952
Bohemian Kings:
1 king
King Ludvík (a.k.a. Louis) 1516-1526
Canadian Prime Ministers:
1 prime minister
Louis St. Laurent 1948-1957
Dutch Prime Ministers:
1 prime minister
Louis Beel 1946-1948; 1958-1959
Eurovision Song Contest Winners:
1 winner
Louis Herrey 1984 Sweden
Fictional Characters from Books:
1 character, 1 hero
Louis Trevelyan 1869 He Knew He Was Right
André-Louis Moreau 1921 Scaramouche
Fictional Characters from Television:
3 characters
Lou Rodriguez 1984 Miami Vice
Lou Carpenter (a.k.a. Louis) 1985 Neighbours
Louis Gardino 1994 Due South
Frankish and French Kings:
22 kings, 1 emperor
King Clovis I (a.k.a. Louis) 481-511
King Clovis II (a.k.a. Louis) 639-655
King Clovis III (a.k.a. Louis) 675-676
King Clovis IV (a.k.a. Louis) 691-695
King Louis I the Pious 813-840
King Louis II the Stammerer 877-879
King Louis III 879-882
King Louis IV the Foreigner 936-954
King Louis V the Indolent 986-987
King Louis VI the Fat 1108-1137
King Louis VII 1137-1180
King Louis VIII the Lion 1223-1226
King Louis IX 1226-1270
King Louis X 1314-1316
King Louis XI the Spider 1461-1483
King Louis XII of Orleans 1498-1515
King Louis XIII 1610-1643
King Louis XIV the Sun King 1643-1715
King Louis XV 1715-1774
King Louis XVI 1774-1792
King Louis XVIII 1814-1824
King Louis Philippe 1830-1848
Emperor Napoleon III (middle name Louis) 1852-1870
French Presidents and Prime Ministers:
8 prime ministers, 3 presidents, 1 prime minister/president
(prime minister) Louis-Mathieu Molé 1836-1839; 1848
(prime minister) Louis-Eugène Cavaignac 1848
(president) Louis-Napoléon Bonaparte 1848-1852
(prime minister) Louis-Jules Trochu 1870-1871
(prime minister/president) Adolphe Thiers (middle name Louis) 1836; 1840; 1871-1873
(prime minister) Ernest Courtot de Cissey (middle name Louis) 1874-1875
(prime minister) Louis Buffet 1875-1876
(prime minister) Charles de Freycinet (middle name Louis) 1879-1880; 1882; 1886; 1890-1892
(prime minister) Émile Combes (middle name Louis) 1902-1905
(prime minister) Louis Barthou 1913
(president) Paul Deschanel (middle name Louis) 1920
(president) Alain Poher (middle name Louis) 1969; 1974
German Kings and Holy Roman Emperors:
1 emperor, 1 king, 1 king-emperor
Emperor Ludwig I the Pious (a.k.a. Louis) 813-840
King Ludwig III the Child (a.k.a. Louis) 900-911
King-Emperor Ludwig IV (a.k.a. Louis) 1314-1347
Haitian Presidents:
6 presidents
(president) Jean-Louis Pierrot 1845-1846
(president) Lysius Salomon (a.k.a. Louis) 1879-1888
(president) Florvil Hyppolite (a.k.a. Louis) 1889-1896
(president) Louis Borno 1922-1930
(president) Louis Eugène Roy 1930
(president) Élie Lescot (middle name Louis) 1941-1946
Hall-of-Famers:
5 baseball, 4 football, 2 basketball
(baseball) Lou Gehrig 1939
(baseball) Lou Boudreau 1970
(football) Lou Groza 1974
(baseball) Hank Aaron (middle name Louis) 1982
(baseball) Lou Brock 1985
(football) Lou Creekmur 1996
(football) Hank Stram (middle name Louis) 2003
(baseball) Louis Santop 2006
(basketball) Louie Dampier 2014
(basketball) Lou Hudson 2022
(football) Chuck Howley (middle name Louis) 2023
Hungarian Kings and Queens:
2 kings
King Lajos I the Great (a.k.a. Louis) 1342-1382
King Lajos II (a.k.a. Louis) 1516-1526
Most Valuable Players:
3 winners
Lou Gehrig 1927; 1936 baseball
Lou Boudreau 1948 baseball
Hank Aaron (middle name Louis) 1957 baseball
Nobel Prize Winners:
2 medicine, 2 physics, 1 chemistry, 1 peace
(peace) Louis Renault 1907
(medicine) Charles Louis Alphonse Laveran 1907
(physics) Louis de Broglie 1929
(physics) Louis Néel 1970
(medicine) Louis Ignarro 1998
(chemistry) Louis E. Brus 2023
Notable Actors and Entertainers:
15 actors, 2 comedians, 1 actor/comedian
Lew Cody (a.k.a. Louis) 1884-1934
Louis Calhern 1895-1956
Larry Fine (a.k.a. Louis) 1902-1975
Lou Costello (a.k.a. Louis) 1906-1959
Richard Denning (a.k.a. Louis) 1914-1998
Louis de Funès 1914-1983
Louis Jourdan 1921-2015
Louis Zorich 1924-2018
Jean-Louis Trintignant 1930-2022
Louis Gossett, Jr. 1936-2024
Lou Ferrigno 1951-
Lou Diamond Phillips 1962-
Louis Ferreira 1966-
Louis Mandylor 1966-
Louis C.K. 1967-
Robinson Stévenin (a.k.a. Louis) 1981-
Justin Baldoni (middle name Louis) 1984-
Louis Hofmann 1997-
Notable Artists:
2 painters, 1 architect, 1 fashion designer, 1 printmaker/drawer/painter
Jacques-Louis David 1748-1825
Louis Vuitton 1821-1892
Louis Sullivan 1856-1924
Lovis Corinth (middle name Louis) 1858-1925
Louis Wain 1860-1939
Notable Athletes:
4 baseball, 1 basketball, 1 boxing, 1 football, 1 rugby, 1 soccer
(baseball) Lou Gehrig 1903-1941
(boxing) Joe Louis (middle name Louis) 1914-1981
(baseball) Lou Boudreau 1917-2001
(baseball) Hank Aaron (middle name Louis) 1934-2021
(baseball) Lou Brock 1939-2020
(basketball) Louie Dampier 1944-
(soccer) Louis van Gaal 1951-
(rugby) Louis Picamoles 1986-
(football) Manti Te'o (middle name Louis) 1991-
Notable Businesspeople:
5 businesspersons
Louis Vuitton 1821-1892
Louis Cartier 1875-1942
Louis Renault 1877-1944
Louis Chevrolet 1878-1941
Louis B. Mayer 1884-1957
Notable Explorers and Adventurers:
2 explorers
Louis Hennepin 1626-1705
Louis Antoine de Bougainville 1729-1811
Notable Filmmakers:
1 director, 1 producer
Louis B. Mayer 1884-1957
Justin Baldoni (middle name Louis) 1984-
Notable Journalists:
1 journalist
(journalist) H. L. Mencken (middle name Louis) 1880-1956
Notable Musicians:
3 composers, 2 singers, 1 musician
Louis-Claude Daquin 1694-1772
Hervé (a.k.a. Louis) 1825-1892
Louis Armstrong 1901-1971
Leonard Bernstein (a.k.a. Louis) 1918-1990
Albert Hammond (middle name Louis) 1944-
Louis Tomlinson 1991-
Notable Philosophers and Thinkers:
2 mathematicians
Joseph Louis Lagrange 1736-1813
Augustin-Louis Cauchy 1789-1857
Notable Scientists and Inventors:
3 inventors, 2 chemists, 2 physicists, 1 naturalist, 1 physician
Georges-Louis Leclerc 1707-1788
Joseph Louis Gay-Lussac 1778-1850
Louis Daguerre 1787-1851
Louis Braille 1809-1852
Louis Pasteur 1822-1895
Charles Louis Alphonse Laveran 1845-1922
Louis Blériot 1872-1936
Louis de Broglie 1892-1987
Louis Néel 1904-2000
Notable Writers:
7 authors, 1 poet, 1 poet/author
Robert Louis Stevenson 1850-1894
Louis Couperus 1863-1923
Louis-Ferdinand Céline 1894-1961
Louis Bromfield 1896-1956
Louis Aragon 1897-1982
Jack Kerouac (middle name Louis) 1922-1969
Jin Yong (a.k.a. Louis) 1924-2018
Thomas Berger (middle name Louis) 1924-2014
Martin Amis (middle name Louis) 1949-2023
Olympic Medalists:
8 bronze, 8 gold, 5 silver/gold, 4 silver, 1 bronze/gold/silver, 1 bronze/silver
(bronze) Louis Glineur 1900 archery - à la pyramide
(bronze) Louis Martin 1900 swimming - 200 m team; swimming - 4000 m freestyle
(bronze) Louis Laufray 1900 water polo
(gold) Louis W. Maxson 1904 archery - team round
(gold) Louis Handley 1904 swimming - 4x50 yard freestyle relay
(silver) Albert Corey (middle name Louis) 1904 4 mile team; marathon
(bronze) Louis Wilkins 1904 pole vault
(silver) Louis Vernet 1908 archery - continental style 50 m
(bronze) Louis Bonniot de Fleurac 1908 3 mile team
(silver) Lewis Tewanina (a.k.a. Louis) 1912 10000 m
(gold) Louis Scott 1912 3000 m team
(silver) Charles Lelong (middle name Louis) 1912 4x400 m relay
(bronze/gold/silver) Julien Brule (middle name Louis) 1920 archery - moving target 28 m, team; archery - moving target 33 m; archery - moving target 33 m, team; archery - moving target 50 m; archery - moving target 50 m, team
(silver/gold) Louis Fierens 1920 archery - moving target 28 m, team; archery - moving target 33 m, team; archery - moving target 50 m, team
(silver/gold) Louis Van de Perck 1920 archery - large fixed target; archery - large fixed target, team; archery - small fixed target; archery - small fixed target, team
(bronze) Louis Balbach 1920 diving - springboard
(gold) Louis Kuehn 1920 diving - springboard
(silver/gold) Louis Delcon 1920 archery - moving target 28 m, team; archery - moving target 33 m, team; archery - moving target 50 m, team
(silver/gold) Louis Van Beeck 1920 archery - moving target 28 m, team; archery - moving target 33 m, team; archery - moving target 50 m, team
(gold) Louis Clarke 1924 4x100 m relay
(gold) Lou Jones 1956 4x400 m relay
(gold) Bob Boozer (middle name Louis) 1960 basketball
(bronze) Paul Genevay (middle name Louis) 1964 4x100 m relay
(gold) Joe Caldwell (middle name Louis) 1964 basketball
(silver/gold) Sam Graddy III (middle name Louis) 1984 100 m; 4x100 m relay
(bronze) Lou Marson 2008 baseball
(bronze/silver) Louis Smith 2008; 2012 artistic gymnastics
Oscar Award Winners:
1 actor
(actor) Louis Gossett, Jr. 1983 An Officer and a Gentleman
Other Royalty:
11 princes, 1 grand duke, 1 king
Louis of Guyenne 1397-1415 France
Louis Ferdinand of Prussia 1772-1806 Prussia
Ludwig of Prussia (a.k.a. Louis) 1773-1796 Prussia
Friedrich of Prussia (middle name Louis) 1794-1863 Prussia
Heinrich of Prussia (middle name Louis) 1900-1904 Prussia
Louis Ferdinand of Prussia 1907-1994 Prussia
Louis II, Prince of Monaco 1922-1949 Monaco
Edward, Duke of Edinburgh (middle name Louis) 1964- United Kingdom
Jean, Grand Duke of Luxembourg (middle name Louis) 1964-2000 Luxembourg
William, Prince of Wales (middle name Louis) 1982- United Kingdom
Philippe (middle name Louis) 2013- Belgium
George of Wales (middle name Louis) 2013- United Kingdom
Louis of Wales 2018- United Kingdom
Polish High Dukes and Kings:
1 king
King Ludwik I (a.k.a. Louis) 1370-1382
Pulitzer Award Winners:
1 literature
(literature) Louis Bromfield 1927 Early Autumn
Saints:
15 blessed, 7 saints
Saint Louis ?-855
Blessed Louis of Thuringia 1200-1227
Saint Louis IX 1214-1270
Saint Louis of Toulouse 1274-1297
Blessed Ludovico Morbioli (a.k.a. Louis) 1433-1485
Saint Luis Bertrán (a.k.a. Louis) 1526-1581
Blessed Luis Sotelo (a.k.a. Louis) 1574-1624
Saint Luis Ibarachi (a.k.a. Louis) 1585-1597
Blessed Louis Chakichi ?-1622
Blessed Louis Kawara ?-1622
Blessed Luis Flores (a.k.a. Louis) ?-1622
Blessed Louis Baba ?-1624
Blessed Luis Sasanda (a.k.a. Louis) ?-1624
Blessed Louis Onizuka Naisen ?-1626
Blessed Louis Maki ?-1627
Blessed Louis Someyon ?-1627
Blessed Luis Bertrán the Younger (a.k.a. Louis) ?-1627
Blessed Louis Nifaki ?-1628
Saint Louis-Marie de Montfort 1673-1716
Saint Jean-Louis Bonnard 1824-1852
Blessed Louis-Zéphirin Moreau 1824-1901
Blessed Luigi Beltrame Quattrocchi (a.k.a. Louis) 1880-1951
Shakespearian Characters:
3 characters
Louis the Dauphin King John
Louis the Dauphin Henry V; King John
Lewis XI (a.k.a. Louis) Henry VI (3)
Spanish Kings and Queens:
1 king
King Luis I (a.k.a. Louis) 1724
Swedish Prime Ministers:
2 prime ministers
Louis Gerhard De Geer 1876-1880
Louis De Geer 1920-1921
Swiss Presidents:
2 presidents
Louis Ruchonnet 1883; 1890
Felix Calonder (middle name Louis) 1918