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

Topics referred to by the same term

This disambiguation page lists articles about distinct geographical locations with the same name.
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