Irwin Unger was an American historian and academic specializing in economic history, the history of the 1960s, and the history of the Gilded Age. He earned his Ph.D. from Columbia University in 1958 and is currently Professor Emeritus of History at New York University.

Iryna Mykolayivna Bilyk is a Ukrainian singer, songwriter, and People's Artist of Ukraine.

Iryna Onufriyivna Kalynets was a Ukrainian poet, writer, activist and Soviet dissident during the 1970s. Kalynets was the wife of another Soviet dissident, Ihor Kalynets.

Iryna Khalip is a Belarusian journalist, reporter and editor in the Minsk bureau of Novaya Gazeta, known for her criticism of Belarusian President Alexander Lukashenko.

Iryna Tsilyk is Ukrainian filmmaker and writer, the member of European Film Academy, Ukrainian PEN International. The winner of the “Directing Award: World Cinema Documentary” for the film "The Earth Is Blue as an Orange" at 2020 Sundance Film Festival.

Daryna Dmytrivna Polotniuk, better known by her pen name Iryna Vilde, was a Ukrainian and Soviet writer and correspondent. Vilde's works are now considered classics of Ukrainian literature.

Iryna Oleksandrivna Yevsa is a Russian-language Ukrainian poet and translator. She lives in Kharkiv, Ukraine.

Irina (Iraida) Volodymyrivna Zhylenko, a Ukrainian poet, was the a wife of Volodymyr Drozd. She was born in Kyiv and died in August 2013 at the age of 72.

Isa or Isabella Jane Blagden was an English-language novelist, speaker, and poet born in the East Indies or India, who spent much of her life among the English community in Florence. She was notably friendly with the Browning, Bulwer-Lytton and Trollope families.

Isa Kamari is a Singaporean writer. He was awarded the Cultural Medallion in 2007.