| Huahum River | |
| Source1 Location: | Lácar Lake |
| Mouth Location: | Pirihueico Lake |
| Subdivision Type1: | Countries |
The Huahum River (es|Río Huahum pronounced as /es/) is a river in southern Chile and Argentina. It drains the waters of Lácar Lake in Argentina to Pirihueico Lake in Chile. The river gives name to Huahum Pass, an international mountain pass on the border between Chile and Argentina.