Ayu
Ayu may refer to:
- Ayu, a species of fish
- Ayu, a nickname of Japanese singer Ayumi Hamasaki
- Ayu Tsukimiya, a character in the visual novel Kanon
- AYU, the IATA airport code of Aiyura Airport
- Ayu Islands, a small archipelago in Indonesia
- Ayu-Dag, a peak in Crimea, Ukraine
- Ayu Tateishi, a character from the manga and anime Ultra Maniac