Kastamonu Eyalet () was an eyalet of the Ottoman Empire.
Administrative divisions
Sanjaks of the Eyalet in the mid-19th century:
- Sanjak of Kocaeli (Bithynia)
- Sanjak of Bolu (Paphlagonia)
- Sanjak of Virantsehir (Honorias) (near Eskipazar?)
- Sanjak of Sinope (Helenopontus)
References