Kocaeli may refer to:
- Sanjak of Kocaeli, an Ottoman province
- Kocaeli Province, Turkey
- Kocaeli, an alternative name for İzmit
- Kocaeli Peninsula, the peninsula at the north west point of Anatolia
- Kocaeli, İvrindi, a village
This disambiguation page lists articles about distinct geographical locations with the same name.
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