Namesakes
Benny Nielsen
(a.k.a. Leo) (m) 1966- 
Olympic Medalists 1988 swimming - 200 m butterfly (silver)
Branscombe Richmond
(a.k.a. Leo) (m) 1955-
Notable Actors and Entertainers (actor)
Flavius Valerius Leo
(a.k.a. Leo) (m) 401-474
Roman and Byzantine Emperors 457-474
Flavius Leo Junior
(a.k.a. Leo) (m) 467-474
Roman and Byzantine Emperors 474
Gabby Hartnett
(a.k.a. Leo) (m) 1900-1972
Hall-of-Famers 1955 (baseball)
Most Valuable Players 1935 baseball
James Dillion
(a.k.a. Leo) (m) 1929-2010
Olympic Medalists 1952 discus throw (bronze)
Johnny Hallyday
(a.k.a. Léo) (m) 1943-2017
Notable Musicians
Joseph L. Mankiewicz
(a.k.a. Leo) (m) 1909-1993
Notable Filmmakers
Oscar Award Winners 1950; 1951 A Letter to Three Wives; All About Eve (director)
Leo
(m)
Characters in Greek Mythology
Leo
(m) ?-260
Saints
Leo I the Great
(m) c. 400-461
Bishops of Rome and the Popes 440-461
Saints (Leo the Great)
Leo
(m) ?-541
Saints
Leo
(m) ?-550
Saints
Leo II
(m) 611-683
Bishops of Rome and the Popes 682-683
Saints
Leo
(m) 685-741
Roman and Byzantine Emperors 717-741
Leo
(m) ?-706
Roman and Byzantine Emperors 695-698
Leo III
(m) 750-816
Bishops of Rome and the Popes 795-816
Saints
Leo
(m) 750-780
Roman and Byzantine Emperors 775-780
Leo
(m) 775-820
Roman and Byzantine Emperors 813-820
Leo
(m) ?-787
Saints
Leo IV
(m) 790-855
Bishops of Rome and the Popes 847-855
Saints
Leo of Carentan
(m) 856-890
Saints
Leo
(m) 866-912
Roman and Byzantine Emperors 886-912
Leo VI
(m) 880-928
Bishops of Rome and the Popes 928
Leo Luke
(m) ?-900
Saints
Leo
(m) ?-900
Saints
Leo V
(m) ?-904
Bishops of Rome and the Popes 903
Leo VII
(m) ?-939
Bishops of Rome and the Popes 936-939
Leo VIII
(m) ?-965
Bishops of Rome and the Popes 964-965
Leo of Nonantula
(m) ?-1000
Saints
Leo IX
(m) 1002-1054
Bishops of Rome and the Popes 1049-1054
Saints
Leo of Lucca
(m) ?-1079
Saints
Leo of Saint-Bertin
(m) ?-1163
Saints
Leo X
(m) 1475-1521
Bishops of Rome and the Popes 1513-1521
Leo XI
(m) 1535-1605
Bishops of Rome and the Popes 1605
Leo XII
(m) 1760-1829
Bishops of Rome and the Popes 1823-1829
Leo XIII
(m) 1810-1903
Bishops of Rome and the Popes 1878-1903
Leo Boivin
(m) 1931-2021
Hall-of-Famers 1986 (ice hockey)
Notable Athletes (ice hockey)
Leo Canjels
(m) 1933-2010
Notable Athletes (soccer)
Leo von Caprivi
(m) 1831-1899
German Chancellors and Presidents 1890-1894 (chancellor)
Leo Chingkwake
(m)
Fictional Characters from Television 1998 That '70s Show
Leo Dalton
(m)
Fictional Characters from Television 1996 Silent Witness
Léo Delibes
(m) 1836-1891
Notable Musicians
Leo Durocher
(m) 1905-1991
Hall-of-Famers 1994 (baseball)
Leo Falcam
(m) 1935-2018
Other Leaders 1999-2003 Federated States of Micronesia (president)
Leo Fender
(m) 1909-1991
Notable Businesspeople
Notable Scientists and Inventors
Leo Fisher
(m)
Fictional Characters from Television 1999 Once and Again
Leo Goodwin
(m) 1883-1957
Olympic Medalists 1904; 1908 diving - plunge for distance; swimming - 4x50 yard freestyle relay; water polo; swimming - 4x200 m freestyle relay (gold/bronze)
Leo Karasuma
(m) ?-1597
Saints
Leo Komarov
(m) 1987-
Olympic Medalists 2014 ice hockey (bronze)
Leo Kombiogi
(m) ?-1628
Saints
Leo Larrivee
(m) 1903-1928
Olympic Medalists 1924 3000 m team (bronze)
Leo Ignatius Mangin
(m) ?-1900
Saints
Leo Markus
(m)
Fictional Characters from Television 1998 Will & Grace
Leo Mason
(m)
Fictional Characters from Television 2012 Major Crimes
Leo McCarey
(m) 1898-1969
Notable Filmmakers
Oscar Award Winners 1938; 1945 The Awful Truth; Going My Way (director)
Leo McKern
(m) 1920-2002
Notable Actors and Entertainers (actor)
Leo Nakanishi
(m) ?-1619
Saints
Leo Nomellini
(m) 1924-2000
Hall-of-Famers 1969 (football)
Leo Peelen
(m) 1968-2017
Olympic Medalists 1988 cycling - track (silver)
Leo Satsuma
(m) ?-1622
Saints
Leo Sayer
(m) 1948-
Notable Musicians
Leo Sexton
(m) 1909-1968
Olympic Medalists 1932 shot put (gold)
Leo Suchiemon
(m) ?-1622
Saints
Leo Tanaka
(m) ?-1617
Saints
Leo Tindemans
(m) 1922-2014
Belgian Prime Ministers 1974-1978
Leo Tolstoy
(m) 1828-1910
Notable Writers
Leo Varadkar
(m) 1979-
Irish Presidents and Prime Ministers 2017-2020; 2022-2024 (prime minister)
Leo Visser
(m) 1966-
Olympic Medalists 1988; 1992 speed skating (silver/bronze)
Leo Wyatt
(m)
Fictional Characters from Television 1998 Charmed
Leonardo Gutiérrez
(a.k.a. Leo) (m) 1978-
Olympic Medalists 2004; 2008 basketball (gold/bronze)
Leonel Manzano
(a.k.a. Leo) (m) 1984-
Olympic Medalists 2012 1500 m (silver)
Leonhard Pohl
(a.k.a. Leo) (m) 1929-2014
Olympic Medalists 1956 4x100 m relay (bronze)
Norman "Fatboy Slim" Cook
(a.k.a. Leo) (m) 1963-
Notable Musicians
Reona Esaki
(a.k.a. Leo) (m) 1925-
Nobel Prize Winners 1973 (physics)
Notable Scientists and Inventors
Taye Diggs
(a.k.a. Leo) (m) 1971-
Notable Actors and Entertainers (actor)
Veikko Karvonen
(a.k.a. Leo) (m) 1926-2007
Olympic Medalists 1956 marathon (bronze)