Kocaelispor is a Turkish football club based in İzmit, Kocaeli. They were founded in 1966 and played in the top level between 1980–1988, 1992–2003 and the 2008–09 seasons. Their best finish was in 1992–93 season, where they finished fourth. They have won the Turkish Cup twice, in 1997 and 2002. On 8 January 2015, in front of 20,152 spectators, Kocaelispor set a record for the highest attendance at a Turkish Regional Amateur League encounter.

İzmit is a municipality and the capital 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 İzmit in the Sea of Marmara, about 100 km (62 mi) east of Istanbul, on the northwestern part of Anatolia. Kocaeli Province had a population of 2,079,072 inhabitants in 2022, of whom approximately 1.2 million lived in the largely urban İzmit City metro area made up of Kartepe, Başiskele, Körfez, Gölcük, Derince and Sapanca. Unlike other provinces in Turkey, apart from Istanbul, the whole province is included within the municipality of the metropolitan center.