Igor Hałagida is a Polish historian of Ukrainian descent, a researcher at the Polish Institute of National Remembrance in Gdańsk, and a professor at the Faculty of History of the University of Gdańsk.

Igor Vladimirovich Ilyinsky was a Soviet and Russian stage and film actor, director and comedian. Hero of Socialist Labour (1974) and People's Artist of the USSR (1949).

Igor Moiseyevich Irtenyev (Russian: Игорь Моисеевич Иртеньев; born 25 May 1947, Moscow) is an Israeli poet.

Igor Sergeyevich Ivanov is a Russian politician who was Foreign Minister of Russia from 1998 to 2004 under both the Yeltsin and the Putin administrations.

Igor Alexandrovich Kaberov was a Soviet Naval Aviation colonel, flying ace, and Hero of the Soviet Union. He fought in the Siege of Leningrad and was awarded the title for downing eight enemy aircraft. Kaberov shot down eleven and shared credit for eighteen enemy aircraft during World War II. He was withdrawn from combat in the summer of 1943 and became an instructor pilot, fighting in the Soviet invasion of Manchuria. He retired from the service in 1960 and lived in Veliky Novgorod, where he was a deputy of the city council.

Ihor Kaczurowskyj was a Ukrainian poet, translator, novelist and short story writer, literary scholar, university lecturer, journalist.

Igor Sergeyevich Kholin was a Russian poet and fiction writer and a member of the 'Lianozovo Group'.

Igor Viktorovich Kochetkov is a Russian gay rights activist who heads the Russian LGBT Network.

Igor Vasilyevich Kokhanovsky is a Soviet, Russian bard, poet and lyricist whose songs recorded, among others, Anna German, Sofia Rotaru, Klavdiya Shulzhenko, Lyudmila Zykina and Vladimir Vysotsky, his classmate and friend.

Igor Semyonovich Kon was a Soviet and Russian philosopher, psychologist, and sexologist. His scientific publications have been translated into many languages, such as English, German, and French.