Koyunbaba Bridge is located at the center of Osmancık district in Çorum Province, northern Turkey.

[1] It is the longest stone arch bridge built in Anatolia during the Ottoman Empire era.

An inscription in Ottoman Turkish alphabet gives the beginning and completion dates of the construction in Hijri year as 889 and 894 without naming the architect.

The latest restoration work aiming to reinstate its original state began in July 2014, and continued until 2017.

[2][4] After removal of the mortar on the facades in the first instance, the bridge was closed to motor traffic and pedestrians for further restoration work in November 2015.