| Type: | municipality |
| Gökçesu | |
| Coordinates: | 40.9°N 88°W |
| Province: | Bolu |
| District: | Mengen |
| Elevation M: | 535 |
| Population Total: | 1842 |
| Population As Of: | 2021 |
| Postal Code: | 14850 |
| Area Code: | 0374 |
Gökçesu is a town (belde) in the Mengen District, Bolu Province, Turkey.[1] Its population is 1,842 (2021).[2] It is situated in the forest between two mountain ranges. The distance to Mengen is and to Bolu is . Up to 73 BC, the area around the town was a part of Bithynia Kingdom. Then it became a part of the Roman and the Byzantine Empires. In 1359 it was incorporated into the Ottoman Empire. In 1991 it was declared a seat of township.[3]