A–F •
Ada Leonard (1915–1997), American bandleader •
Adam Leonard (singer-songwriter) (born 1969), English singer-songwriter •
Adna Wright Leonard (1874–1943), Methodist Bishop of Buffalo NY •
André-Joseph Léonard (born 1940), Archbishop of Mechelen-Brussels •
Andrew Leonard, American technology journalist •
Andy Leonard (1846–1903), baseball •
Benny Leonard (born Benjamin Leiner; "The Ghetto Wizard", 1896–1947), American world champion Hall of Fame lightweight boxer •
Bill Leonard (politician) (born 1947), American politician •
Bobby Leonard (1932–2021), American basketball coach •
Brad Leonard (born 1979), New Zealand cricketer •
Brendon Leonard (born 1985), rugby union •
Brian Leonard (born 1984), American football •
Buck Leonard (1907–1997), baseball •
Cecil Leonard (1946–2020), American football •
Chuck Leonard (1937–2004), radio •
Conrad Leonard (1898–2003), pianist •
Courtney M. Leonard (born 1980), American artist and filmmaker •
Cynthia Leonard (1828–1908), suffragist •
Deane Leonard (born 1999), American football player •
Dennis Leonard (born 1951), baseball •
Dick Leonard (1930–2021), British politician •
Dutch Leonard (left-handed pitcher) (1892–1952, Hubert Benjamin Leonard), baseball •
Dutch Leonard (right-handed pitcher) (Emil John Leonard, 1909–1983), baseball •
Edwin Leonard (1823–1900), American Civil War Medal of Honor recipient •
Ego Leonard, anonymous Dutch sculptor, painter, guerrilla artist •
Elijah Leonard (1814–1891), Canadian politician •
Elizabeth Weeks Leonard, American professor •
Elmore Leonard (1925–2013), American novelist •
Emery Clarence Leonard (1892–1968), American botanist •
Fessor Leonard (1953–1978), American basketball player •
Fred Churchill Leonard (1856–1921), American politician •
Frederick C. Leonard (1896–1960), American astronomer
G–L •
Gary Leonard (born 1967), basketball •
George Leonard (1923–2010), American author •
Glenn Leonard (born 1947), American musician •
Gloria Leonard (1940–2014), actress •
Graham Leonard (1921–2010), Anglican Bishop converted to Catholicism •
Gustav Leonhardt (1928–2012), Dutch musician, conductor, musicologist •
Harlan Leonard (1905–1983), American jazz musician •
Harry Ward Leonard (1861–1915), American inventor •
Herbert Léonard (1945–2025), French singer, entertainer and historian •
Herbert B. Leonard (1922–2006), American producer and writer •
Herman Leonard (1923–2010), photographer •
Hookey Leonard, Scottish professional footballer •
Hubert Léonard (1819–1890), Belgian violinist •
Hugh Leonard (1926–2009), Irish playwright •
Isabel Leonard (born 1982), American operatic mezzo-soprano •
J. Paul Leonard (1901–1995), American university president, educator •
J. Rich Leonard, American judge •
Jack E. Leonard (1910–1973), comedian •
Jacqueline Leonard (born 1965), Scottish actress •
James Leonard (disambiguation), several people •
Jason Leonard (born 1968), English rugby union player •
Jeffrey Leonard (born 1955), American baseball player •
Jerris Leonard (1931–2006), American politician •
Jim Leonard (disambiguation), several people •
Jimmy Leonard (1927–2022), Irish politician •
Joe Leonard (1932–2017), motorsports •
John J. Leonard, mayor of Bolingbrook, Illinois •
John Leonard (critic) (1939–2008), American critic, pen name Cyclops •
John Leonard (Gaelic footballer) (born 1976), Gaelic football goalkeeper •
John Leonard (poet) (born 1965), Australian poet •
Johnny Leonard (1903–1995), Australian rules football •
Joseph John Henry Leonard (1863–1929), Australian illustrator •
Joshua Leonard (born 1975), actor •
June Leonard (died 1994), American politician •
Justin Leonard (born 1972), American golfer •
Kawhi Leonard (born 1991), American basketball player •
Larry Leonard (1934–2002), American politician •
Lee Leonard (1929–2018), American TV personality •
Louise Wareham Leonard, American author
M–Z •
Manon Léonard (born 2001), French tennis player •
Margaret Burr Leonard (1942–2022), American civil rights activist and journalist •
Marion Leonard (1881–1956), actress •
Mark Leonard (footballer) (born 1962), association football •
Marshall Leonard (born 1980), soccer player •
Matthew Leonard (1929–1967), Medal of Honor recipient •
Meyers Leonard (born 1992), American basketball player •
Michael Leonard (disambiguation), several people •
Minnetta Sammis Leonard (1879 – 1960), American educator •
Miriam Leonard (born 1977), British professor of Greek literature •
Nelson J. Leonard (1916–2006), American organic and bioorganic chemist •
Patricia Leonard (1936–2010), English opera singer •
Patrick James Leonard (1847–1899), Medal of Honor recipient •
Patrick Leonard (born 1956), American songwriter •
Patrick Thomas Leonard (1828–1905), Indian Wars Medal of Honor recipient •
Paul Leonard (politician) (born 1943), American politician •
Paul Leonard (writer), UK author •
Philippe Léonard (born 1974), soccer •
Priscilla Leonard, pen name for Emily Perkins Bissell, an American social worker and activist •
Ranginui Parewahawaha Leonard (1872–1984), New Zealand weaver, farmer and kuia •
Rick Leonard (born 1996), American football •
Robert A. Leonard, American linguist known for his forensic work and former singer for Sha Na Na •
Robert Maynard Leonard (1869–1941), English journalist and editor •
Robert Sean Leonard (born 1969), actor •
Robert Z. Leonard (1889–1968), director •
Ronald Leonard, cellist •
Ryan Leonard (ice hockey) (born 2005), American ice hockey player •
Sarah Leonard (archer) (1862–1951), archery •
Scott Leonard (born 1965), American musician •
Shaquille Leonard (born 1995), American football •
Sheldon Leonard (1907–1997), American film and TV producer •
Silvio Leonard (born 1955), Cuban sprinter •
Sonny Leonard (1943–2021), American businessman •
Stan Leonard (1915–2005), Canadian golfer •
Stephen B. Leonard (1793–1876), American politician •
Steve Leonard (born 1972), English TV personality •
Sugar Ray Leonard (born 1956), American boxer •
Tasha Cobbs Leonard (born 1981), American gospel singer •
Thomas Arthur Leonard (1864–1948), English pioneer of outdoor holidays •
Tom Leonard (Irish politician) (1924–2004) •
Tom Leonard (poet) (1944–2018), Scottish poet •
Tony Leonard (born 1947), Australian radio presenter •
Turney W. Leonard (1921–1944), Medal of Honor recipient •
Vincent Leonard (1908–1994), Bishop of Pittsburgh •
William E. Leonard (1836–1891), American Civil War Medal of Honor recipient •
William Ellery Leonard (1876–1944), American poet •
William J. Leonard (1927–2006), American football •
William Leonard (Scottish politician) (1887–1969) •
Wrexie Leonard (1867–1937), American astronomer •
Leonard (baseball), first name unknown, played in one Major League Baseball game in 1892 ==Fictional characters==