Hitomi Sagan (左岸 瞳, Sagan Hitomi) is a supporting character in AI: THE SOMNIUM FILES, a minor character featured in AI: THE SOMNIUM FILES - nirvanA Initiative, and a character mentioned in the Lemniscate YouTube series.

She is the single mother of Iris Sagan, and an elementary school teacher at the local school. When she was 17 years old, she attended Eitoku High, where she became friends with Renju Okiura. That same year, she lost both of her parents in an accident. Due to an injury she received in the past, she lost the ability to use her right arm.