| Moonan Brook | |
| Name Other: | Bells Creek |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | New South Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | Sydney Basin (IBRA), Upper Hunter |
| Subdivision Type5: | Local government area |
| Subdivision Name5: | Upper Hunter |
| Length: | 26km (16miles) |
| Source1: | Mount Barrington, Mount Royal Range |
| Source1 Location: | Barrington Tops National Park |
| Source1 Elevation: | 1350m (4,430feet) |
| Mouth: | confluence with the Hunter River |
| Mouth Location: | at Moonan Flat |
| Mouth Elevation: | 410m (1,350feet) |
| River System: | Hunter River catchment |
| Custom Label: | National park |
| Custom Data: | Barrington Tops NP |
| Extra: | [1] |
Moonan Brook, a mostly perennial stream of the Hunter River catchment, is located in the Hunter region of New South Wales, Australia.
Officially designated as a river, the Moonan Brook rises below Mount Barrington on the western slopes of Mount Royal Range. The river flows generally west northwest before reaching its confluence with the Hunter River near the locality of Moonan Flat, east of . Moonan Brook descends over its course.[1]