Aioi (Japanese: 相生) may refer to:
Places in Japan
- Aioi, Tokushima (相生町 Aioi-chō), the former name of a town in Naka District, Tokushima
- Aioi, Hyōgo (相生市 Aioi-shi)), a city in Hyōgo Prefecture
- Aioi Bridge (相生橋 Aioi hashi), a T-shaped bridge in the center of Hiroshima
Train stations in Japan
- Aioi Station (Gifu), located in Gujō, Gifu Prefecture
- Aioi Station (Gunma), located in Kiryū, Gunma Prefecture
- Aioi Station (Hyōgo), located in Aioi, Hyōgo, Hyōgo Prefecture
- Nishi-Aioi Station, also located in Hyōgo Prefecture
- Sanuki-Aioi Station, located in Higashikagawa, Kagawa Prefecture
People
- Chieko Aioi (相生 千恵子, 1934–2013), Japanese actress and voice actress
- Takahide Aioi (相生 高秀, 1912–1993), fighter pilot in the Imperial Japanese Navy (IJN) who subsequently became a commander of the Japan Maritime Self-Defense Force
- Yoshitaro Aioi (相生 由太郎, 1867–1930) (ja:Yoshitaro Aioi), Japanese entrepreneur who played a significant role in Manchuria during the Meiji, Taisho, and Showa eras
Other
- Yūko Aioi (相生 祐子), a fictional character in the Japanese comedy manga Nichijou
- Aioi Insurance company [ja], a Japanese insurance company
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