Ignaz Jastrow was a German economist and historian.

Ignaz Schnitzer was an Austrian famous writer, journalist, translator, librettist and newspaper founder of Hungarian origin.

Ignazio Guidi was an Italian orientalist. He became professor at the University of Rome. He is known as a Hebraist and for many translations.

Secondino Tranquilli, known by the pseudonym Ignazio Silone, was an Italian political leader, novelist, and short-story writer, world-famous during World War II for his powerful anti-fascist novels. He was nominated for the Nobel Prize for Literature ten times.

Hugó Veigelsberg was a noted Hungarian editor and writer who usually published under the pen name Ignotus. He was distinguished for the lyric individuality of his poems, stories, and sociological works. In addition to "Ignotus", he also wrote under the pseudonyms "Dixi," "Pató Pál," and "Tar Lorincz".

Igor Ivanovich Akimushkin was a Soviet zoologist and writer.

Igor Viktorovich Blauberg was a Soviet philosopher and cyberneticist. Blauberg was Head of Systems Approach and Interdisciplinary Research Laboratory of the Research Institute for Systems Studies in Moscow. He is known for his pioneering work in the field of systems theory in Russia.

Igor Bunich was a Russian historian known for offering a number of revisionist interpretations of Russian history. He is most famous for claiming that Joseph Stalin was actively preparing to invade western Europe in 1941 before any suggestion of the German eastward assault in Operation Barbarossa.

Igor Butman PAR is a Russian jazz saxophonist born in St. Petersburg, Russia in 1961. Butman holds dual citizenship for both the US and Russian Federation. He is considered to be a virtuoso saxophonist, and a skilled bandleader.

Igor Borisovich Chubais is a Russian philosopher and sociologist, Doctor of Sciences, and the author of many scientific and journalistic works. He is an initiator of the introduction of the Russian education system a new subject Russian studies. He is the first dean of "Russian studies" department at the Institute of Social Sciences and the director of Inter-University center for Russian studies in the faculty of Humanities and Social Sciences at the Peoples' Friendship University of Russia. He is a board member of the Russian Writers Union.