Aoi may refer to:
- Ao (color), a Japanese color word (noun)
- Aoi, the Japanese adjectival form of ao
- Aoi, the Japanese name for various plants used in Japanese heraldry, including the hollyhock and the wild ginger (Asarum caulescens)
- Aoi Matsuri, a hollyhock festival that takes place annually on 15 May in Kyoto, Japan
- Aoi (trigraph), the three letters "aoi"
- Aoi Ward of Shizuoka City, Shizuoka Prefecture, Japan
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