Kaduy (Russian: Кадуй) is the name of several inhabited localities in Russia.
- Urban localities
- Rural localities
- Kaduy, Irkutsk Oblast, a village in Nizhneudinsky District of Irkutsk Oblast
- Kaduy, Chuprinsky Selsoviet, Kaduysky District, Vologda Oblast, a village in Chuprinsky Selsoviet of Kaduysky District in Vologda Oblast