Kastamonu Eyalet () was an eyalet of the Ottoman Empire.

Administrative divisions Sanjaks of the Eyalet in the mid-19th century: By James Henry Skene Sanjak of Kocaeli (Bithynia) Sanjak of Bolu (Paphlagonia) Sanjak of Virantsehir (Honorias) (near Eskipazar?) Sanjak of Sinope (Helenopontus)

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