| Type: | municipality |
| Seydiler | |
| Province: | Kastamonu |
| District: | Seydiler |
| Leader Party: | MHP |
| Leader Name: | Mehmet Erdoğan |
| Elevation M: | 1064 |
| Population Total: | 2851 |
| Population As Of: | 2021 |
| Area Code: | 0366 |
| Blank1 Name: | Climate |
| Blank1 Info: | Cfb |
Seydiler is a town in the Kastamonu Province in the Black Sea region of Turkey. It is the seat of Seydiler District.[1] Its population is 2,851 (2021).[2] The town lies at an elevation of 10640NaN0.[3]