| Official Name: | Bolshaya Sazanka |
| Native Name: | Большая Сазанка |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Amur Oblast#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Amur Oblast |
| Subdivision Name3: | Seryshevsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +9:00 |
| Coordinates: | 51.1667°N 137°W[1] |
Bolshaya Sazanka (Russian: Большая Сазанка) is a rural locality (a selo) and the administrative center of Bolshesazansky Selsoviet of Seryshevsky District, Amur Oblast, Russia. The population was 607 as of 2018.[2] There are 8 streets.
Bolshaya Sazanka is located on the Zeya River, 23 km northwest of Seryshevo (the district's administrative centre) by road. Voronzha is the nearest rural locality.[3]