| Frederick | |
| Name Etymology: | Frederick Roe, the son of John Septimus Roe |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | Western Australia |
| Subdivision Type3: | Region |
| Subdivision Name3: | Gascoyne, Pilbara |
| Length: | 77km (48miles) |
| Discharge1 Location: | mouth |
| Source1: | Kenneth Range |
| Source1 Location: | Pilbara |
| Source1 Coordinates: | -23.9497°N 117.1658°W |
| Source1 Elevation: | 488m (1,601feet) |
| Mouth: | confluence with the Lyons River |
| Mouth Location: | Cobra Station homestead, Gascoyne |
| Mouth Coordinates: | -24.1881°N 116.6056°W |
| Mouth Elevation: | 357m (1,171feet) |
| River System: | Gascoyne River catchment |
| Tributaries Left: | Mulga Wash |
| Custom Label: | National park |
| Extra: | [1] [2] |
The Frederick River is a river that is located in the Gascoyne and Pilbara regions of Western Australia.
The headwaters of the river rise in the Kenneth Range. The river flows in a south-westerly direction, joined by one minor tributary until it reaches its confluence with the Lyons River near Cobra Station homestead. The river descends over course.[1]
The river was named in 1866 by the explorer Edward Hooley who was on expedition in the area after Frederick Roe, the son of John Septimus Roe.