| Berezayka River | |
|---|---|
| Origin | Berezay Lake |
| Mouth | Msta River |
| Basin countries | Russia |
| Length | 150 km |
| Source elevation | 205 m |
| Avg. discharge | 27 m³/s |
| Basin area | 3,230 km² |
Berezayka (Russian: Березайка) is a river in Novgorod Oblast and Tver Oblast of Russia. Berezayka starts from the Berezay Lake in the Valdai Hills at , flows through a number of lakes including the southeastern part of the Piros Lake, and joins the Msta River at Berezovsky Ryadok village at .
It is a popular rafting route. The main tributary of Berezayka is Valdayka River.