:
Ordered alphabetically by last name •
Isidore Gordon Ascher (1835–1933), British-Canadian novelist and poet •
Isidor Bajic (1878–1915), Serbian composer, pedagogue and publisher •
Isidore Bakanja (c. 1885–1909), beatified martyr in the Belgium Congo •
Isidor George Beaver (1859–1934), British-born Australian architect •
Isadore "Kid Cann" Blumenfeld (1900–1981), Romanian-born American gangster •
Isadore Coop (1926–2003), Canadian architect •
Isador Coriat (1875–1943), American psychiatrist and neurologist •
Ivor Cutler (born Isadore; 1923–2006), Scottish poet, songwriter and humorist •
Isidore Ducasse (1846-1870), French poet best known under the nom de plume of Comte de Lautréamont • Isidor
Izzy Einstein (1880–1938), American federal police officer during the Prohibition era •
Isidor Fisch (1905–1934), German associate of Bruno Hauptmann • Isadore
Friz Freleng (1906–1995), American cartoonist •
Isidore Goldblum (1863–1925), Polish Hebrew writer and bibliographer •
Isador Goodman (1909–1982), South African-Australian musician and composer •
Isidor Gunsberg (1854–1930), Hungarian chess player • Isidore Itzkowitz (1892–1964), better known as
Eddie Cantor, American performer and comedian •
Isadore Gilbert Jeffery (1840–1919), American poet, lyricist •
Isidor Kaufmann (1853–1921), Austro-Hungarian painter of Jewish themes •
Izidor Kürschner (1885–1941), Hungarian football player and coach •
Isadore Gilbert Mudge (1875–1957), American librarian • Isidore Newman (fl. 1903), founder of the
Isidore Newman School •
Isidore Okpewho (1941–2016), Nigerian writer and critic •
Isidor Philipp (1863–1958), Hungarian-French pianist, composer and pedagogue •
Isidor Isaac Rabi (1898–1988), Galician-born American physicist and Nobel laureate •
Maximilien François Marie Isidore de Robespierre (1758–1794), French lawyer and revolutionary •
Isidor Rosenthal (1836–1915), German physiologist •
Isadore Singer (1924–2021), American mathematician •
Isador Sobel (1858–1939), American lawyer •
Isidore Spielmann (1854–1925), British art critic and exhibition organizer •
I. F. Stone (1907–1989), American investigative journalist •
Isidor Straus (1845–1912), co-owner of Macy's, drowned in the sinking of RMS
Titanic •
Isador Samuel Turover (1892–1978), Belgian-American chess master • Chief Isadore (fl. 1860s), leader of the
Ktunaxa/Kootenay people in the Tobacco Plains War