| Kastamonu Subregion | |
| Native Name: | Kastamonu Alt Bölgesi |
| Native Name Lang: | tr |
| Settlement Type: | Subregion |
| Subdivision Type: | Country |
| Subdivision Name: | Turkey |
| Subdivision Type1: | Region |
| Subdivision Name1: | West Black Sea |
| Area Total Km2: | 26,358 |
| Population Total: | 763,570 |
| Population As Of: | 2013 |
| Population Density Km2: | auto |
| Population Rank: | 26th |
| Population Urban: | 436,385 |
| Population Rural: | 327,185 |
The Kastamonu Subregion (Turkish: Kastamonu Alt Bölgesi) (TR82) is a statistical subregion in Turkey.