Söğüt ([ˈsœ.yt]) is a town and district in Bilecik Province, Turkey. It is located in the Marmara region in the north-west of the country, with an area of 599 km² (231 sq mi), bordering Bilecik to the west, Gölpazarı to the north, İnhisar to the north-east, Tepebaşı (Eskişehir) to the south-east, and Bozüyük to the south-west. Söğüt district has 5 boroughs and 23 villages, with the population last recorded as 21,012 citizens (2000), but according to a 2010 estimate the population was 19,425.

Söğüt is notable as the founding location and first capital of the Ottoman Empire from 1299 to 1335.