Kadıköy is a large, populous, and cosmopolitan district of Istanbul, Turkey on the northern shore of the Sea of Marmara.
The population of Kadıköy district, according to the 2012 census, is 531.997. 
The district is home to the Turkish football club Fenerbahce SK's home venue, the Sukru Saracoglu Stadium. Before Fenerbahce Sukru Saracoglu Stadium was built, the field was known as Papazin Cayiri (The field of the priest) and was property of the Catholic Community. 6 Temmuz 1932'de, dönemin Adalet bakanı ve aynı zamanda Fenerbahce başkanı olan Sukru Saracoglu'nun çıkardığı özel bir yasa ile araziye el konuldu ve Fenerbahce'ye sembolik bir bedelle devredildi.
- Bagdat Avenue a high street in an upper-scale residential area.
- Haydarpasa Terminal a major intercity terminal and transport hub.
- Ziverbey Villa torture center in the period of fascist military coups of 1971 and 1980. 
- Erenkoy Villa torture center in the period of fascist military coups of 1971 and 1980.
- Fenerbahce Orduevi military officer's club for the most senior military commanders of Turkish Army.