| Ambarnaya | |
| Length: | 60km (40miles) |
| Mouth: | Lake Pyasino |
| Progression: | Lake Pyasino→ |
| Basin Size: | 428km2 |
| Basin Landmarks: | Kayerkan |
| Tributaries Right: | Daldykan |
The Ambarnaya (Russian: Амбарная|translation=barn girl) is a river in Siberia which flows in a northerly direction into Lake Pyasino. On leaving Lake Pyasino, the waters emerge as the river Pyasina. It shares a common delta with the river Norilskaya. It is long, and has a drainage basin of .
The river is fed by rain and meltwater. It is shallow and its bed consists of glacial moraine – gravel and pebbles. It is heavily polluted by the mining industry of Norilsk, namely Nornickel, so fishing is no longer possible.
See main article: 2020 Norilsk oil spill. In May 2020, 20,000 tonnes of diesel fuel spilt into the river from a power plant. With a 12km (07miles) stretch of river seriously affected, Russia's president, Vladimir Putin, declared a state of emergency.