Silivri is a city and a district in Istanbul Province along the Sea of Marmara in Turkey, outside metropolitan Istanbul, containing many holiday and weekend homes for residents of the city. The largest city in the district is also named Silivri. The mayor is Özcan Işıklar (CHP).
Silivri is located bordering Büyükçekmece to the east, Çatalca to the north, Çorlu and Marmara Ereğli (both districts of Tekirdağ Province) to the west, Çerkezköy to the north-west (one of Tekirdağ Province) and with the Sea of Marmara to the south. It is with an area of 760 km2 (290 sq mi) the second largest district of Istanbul Province after Çatalca. The seat of the district is the city of Silivri.
The district consists of 8 towns and 18 villages, and its population is 108,155 (2000 census). 44,530 in the city of Silivri, the remaining in the surrounding towns and villages - listed below.
Established in 2008, Turkey's most modern and Europe's largest prison complex is located 9 km (5.6 mi) west of Silivri.