Kocaeli may refer to:
*
Sanjak of Kocaeli
The Sanjak of Kocaeli was a second-level Ottoman province ('' sanjak'' or '' liva'') with capital at Iznikmid/Izmid (Byzantine Nicomedia, modern Izmit).
History
Kocaeli derives its name from Akça Khodja, an Ottoman Turkish warleader who be ...
, an Ottoman province
*
Kocaeli Province
Kocaeli Province (, ) is a Provinces of Turkey, province and Metropolitan municipalities in Turkey, metropolitan municipality of Turkey and one of only three not to have the same official name as its capital, Ä°zmit, which is thus also sometim ...
, Turkey
*Kocaeli, an alternative name for
Ä°zmit
Ä°zmit () is a municipality and the capital Districts of Turkey, district of Kocaeli Province, Turkey. Its area is 480 km2, and its population is 376,056 (2022). The capital of Kocaeli Province, it is located at the Gulf of Ä°zmit in the Sea ...
*
Kocaeli Peninsula
The Kocaeli Peninsula () lies in the northwest corner of Anatolia, Turkey, separating the Black Sea and the Sea of Marmara on the Asian side of the strait of Bosphorus. Approximately one-third of Istanbul, one of the most populous cities of the wo ...
, the peninsula at the north west point of Anatolia
*
Kocaeli, Ä°vrindi, a village
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