| Type: | town |
| Marnoo | |
| State: | vic |
| Lga: | Shire of Northern Grampians |
| Postcode: | 3387 |
| Pop: | 99 |
| Use Lga Map: | yes |
| Coordinates: | -36.65°N 142.8833°W |
| Stategov: | Ripon |
| Fedgov: | Mallee |
| Dist1: | 288 |
| Dir1: | NW |
| Location1: | Melbourne |
| Dist2: | 174 |
| Dir2: | NW |
| Location2: | Ballarat |
| Dist3: | 69 |
| Dir3: | E |
| Location3: | Horsham |
| Dist4: | 29 |
| Dir4: | W |
| Location4: | St Arnaud |
Marnoo is a town in the Wimmera region of Victoria, Australia. Its postal code is 3387. At the, Marnoo and the surrounding area had a population of 99.[1]