Bilecik Province (Turkish: Bilecik ili) is a province in midwest Turkey, neighboring Bursa to the west, Kocaeli and Sakarya to the north, Bolu to the east, Eskişehir to the southeast and Kütahya to the south.

[1] Most of the province laid down in Marmara Region but eastern parts of Gölpazarı and Söğüt district and districts of İnhisar and Yenipazar remained in Black Sea Region, smaller southeastern parts of Bozüyük and Söğüt remained in Central Anatolia Region and smaller southwestern part of Bozüyük remained in Aegean Region.

Bilecik Province contains wide array of geographical and climatic zones in its borders.

The town Bilecik is famous for its numerous restored Turkish houses.

Some other sites of interest in the province are: Osman Gazi and Orhan Gazi Mosques, Seyh Edebali and Mal Hatun mausoleums, Köprülü Mehmet Pasha Mosque, Köprülü Caravanserai, Kaplikaya tombs, Rüstem Pasha Mosque, and Gülalan Pavilion.